I had a very pleasant stay at Yannis's place. The room (with shared kitchen) is located in an apartment that could not be more central: it is a few minutes from Monasteraki metro station, connecting directly to the airport, Piraeus and a few other central metro stations like Sygrou Fix and Syntagma; although you can also walk to Syntagma). The Akropolis is around 10 minutes away by foot. Around the place there are neat little cafes, bars, restaurants and tavernas (some very cool ones within walking distance). The room was clean, no frills (although it had a rather elegant artistic style), and very functional. Yannis was very thoughtful and checked-in with me on a daily basis to make sure everything is all right. The check-in instructions were very clear. Highly recommend for a comfortable, no hassle, easy stay in Athens.