The quality of the rooms at this Sheraton property varies considerably, so your experience here will depend on which room you are assigned. We have been here a few times and have stayed in a number of rooms, some better than others. Our visits have been using Starwood points or paid for by my husband's employer; this is not a property I would spend my own money on. In London there are better options in the same price range. On our most recent stay the room was ordinary, with no view - an older motel style room in atmosphere. (This was a points stay). However, it did have the comfortable Sheraton beds. The safe did not work, and after we complained they gave us a complimentary breakfast, which was nice. We have had better rooms here, however, even overlooking Green Park, and even when using Starwood points. We also have had worse rooms. On one notable occasion our original suite was very hot and stuffy due to an unaccustomed London heatwave, the airconditioning was not working, so we were moved very late at night to a room way up high in the hotel (maybe where the maids used to live) which was less than mediocre indeed , but all they had available for that night. Even the room we eventually ended up in that time was hot, although the A/C worked; it was so hot that they had to bring in a fan as well. This is probably not a hotel to stay in if it is summer, as it will be very uncomfortable.
We've had breakfast a few times here, it is expensive and done better elsewhere. Likewise drinks and coffee in the Palm Court lounge. (For a cheaper breakfast option you can get carryout coffee and croissants from a number of places nearby.) However, both the Palm Court lounge and the beautiful art deco Silver Ballroom are definitely worth looking at; they have been in several movies and TV shows.
Location is excellent, Green Park tube is close, and the interesting Shepherds Market area has lots of restaurants. We like El Pirata tapas restaurant, just round the corner, and Sofra for Middle Eastern food, a bit further away. As other reviewers have noted, the lobby is at the back of the hotel in an alley, but cabbies know this and should drop you off there.
It is interesting to stay here, in a former Park Lane Mansion, really worth putting up with the quirks of the hotel for the experience. So long as you are using Starwood points, or your company pays, or you get a very good deal.

If you are thinking of booking this hotel, please be aware that you are paying your well earned money on the address but not the quality of the place.
I was in room 145 which is a Classic Room. Its very small, dark and the bathroom is something out of a museum! I mean hand held shower and basin that is from the 1970's or earlier! The bed is very comfortable as it is in all Sheratons.
On the morning of departure, I asked for a slightly later check out, I suggested maybe 1 or 2 pm instead of the 12pm usual check out. The Receptionist said it was possible, Great! but then with the next breathe she said, we charge £15 per hour. What a way to treat a Preferred Guest of Starwood Hotels.
The place for a coffee or afternoon tea is the lovely Palm Court Lounge, very nice but if you go for the afternoon tea it costs £24.00 per person.
On the whole, it's dated, overpriced and you can get more luxury, paying a lot less. Starwood will not have a repeat customer there.

I used 12k Starwood points to stay at the Park Lane Shearton Feb 2008 and had an overall bad experience. Although the staff was very nice and accomodating, the rooms very very dated, carpet very old and looked dirty, very small tv with horrible reception and awful shower. The bathroom was clean, but old and the shower curtain would not stay put- it kept sticking to my body which is just disgusting. The bed was new and was a 2 twins together to make a king- very comfortable and clean. However, overall, the rooms need a major renovation or remodel. The keys to the room are the old style punch cards....not that it matters, but even those are old! The location of this hotel is awesome, but it's not worth staying here. The Sheraton Park Tower just a few blocks away is much much nicer and worth the extra money or points. I was extremely disappointed to waste my hard earned 12k points on this dirty feeling and old hotel.

A night in this hotel with theatre tickets was a Christmas present from our daughter. The Sound of Music was fantastic. Sadly the hotel was not. We have stayed in better 3* hotels.
As has been said by others, the fabric of the hotel is faded and shabby and all the bathrooms need gutting. No shower in a 5* hotel? And the enamel on the bath was coming off, the curtains were tatty and there was no in-room safe. On the plus side the bed was huge and comfortable, and the room was big enough.
The TV and fridge were also old and dated and not exactly state of the art! For these prices I expected at least a power shower, plasma screen etc.
Breakfast was good but at £21.50 each, it should be.