We stayed one night at the Marriott after completing a 12-night cruise. The taxi from Pireaus was 14 Euros. Make sure you settle on a price before you leave. Most quoted 25 Euros, expecting stupid and tired cruise ship passengers exiting the ship. The ride was 15-20 minutes.
We arrived at the Marriott around 9am and was very happy to get our room upon check-in. Perhaps being a member of the Marriott Rewards programs helped, but still - Big kudos to the Athens Marriott.
The room was very nice and had all the goodies in the bathroom. Our view was interior looking out towards other coutyard rooms.
I checked out the gym/spa in the baseroom floor and was satisified with it. No big deal, but okay. Probably better than most US properties, but not the Grand Brantiage-Athens.
The rooftop pool was FANTASTIC ! The view is great, the pool is good and the drinks are expensive. Never had a chance to try out the on-site dining options but they appear to be very nice and very expensive. The check-in/check-out staff were very good, the bellman was helpful with what to pay for taxis. He arranged for an early morning taxi to the airport for 25 Euros which was much cheaper than the 40 Euros previously quoted. The hotel also offers a comp mini-bus shuttle service to the tourist area. The ONLY minus that I would give this hotel is the location. It's on a busy street and not within walking distance of the Plaka/Acropolis area. Otherwise, the hotel is very good!

Fantastic hotel, great staff, "drop dead" view, but could work on the pricing for restaurants. They seem to focus on those business travelers who on are expense accounts and not the 'budget' travelers.
We will definately stay there again!

This is a very nice hotel although, in my view, not as fancy as Marriott hotels in the United States. Still, I was very happy with my room and the general look of the hotel.

The room was spacious and clean and the bath facilities were modern and spotless. The service was quite good. We didn't eat in the hotel so I can't speak about that. However, if you go out of the front of the hotel, turn left, and walk about three blocks, you find a VERY nice "Italian" restaurant called Ciao that's open throughout the day (including breakfast). We ate two breakfasts and one dinner there. As is common in Greece, there is no non-smoking portion so you need to watch where you sit if you care about this. If the weather is good, sit in the shade right outside the front door.

This hotel is NOT convenient to the various attractions, but if you're open to using public transportation you'll do fine. My wife and I always use public transportation when we can.

To get to the hotel from the airport by public transportation, take subway line 3 from the airport and get off at Syntagma Square. There is only one line at the airport and it only goes in one direction (it's the end of the line), so you can't go the wrong way.

When you get to Syntagma Square, go up to the square and walk in the direction of McDonald's. When you cross the street, you'll see bus #40 on your left. Get on. When I was there it cost 0.80 Euros (less than one Euro). In about 20 minutes you'll see the hotel on the left side of the bus. Press the red button to get off the bus and walk under the street using the pedestrian walkway.

To tour the city, I highly recommend bus #400. This is a tourist bus that visits all tourist areas on a round trip. You can hop on and off as much as you want and pay only five Euros for 24 hours. This ticket also includes all other buses and subways (except for those that go to the airport). This is a really good deal and you'll see everything you want to.

To get to bus 400, go out of the hotel and wait to take bus 40 back to Syntagma Square. Then walk halfway up the hill (towards the Parliament Building) and you'll see a big blue sign on the left for bus 400. Pay your fare on the bus.

I never write about or go to a pool when I am traveling abroad. This pool is awesome. After you come home from a day of traveling around greece go up to the pool drink a Methos and look at the Parthenon till it is time to retire to a very comfortable room. As far as the beauty of the hotel it is not the most superior Marriott I have ever vistied but the pool and comfortable rooms are great. I can't speak to how good the food is at the hotel, I still can't figure out why people eat at the hotel when they travel abroad. IF you are on business, fine I understand and sorry I can't help you with that. There are many good restaraunts in walking distance. I can't speak to the bus or taxis because when I was there they were all on STRIKE!!!! But I still didn't have trouble finding someone to take me around. Be patient, the locals are very nice and will bend over backwards to help. Make sure to drink some Ouzo!!!!