We stayed two nights at Alexi's place. We had two couples and it was very spacious. We appreciated a nice table to sit around and eat and play games. We had another 2-night stay at a more expensive place in Piraeus and it was not nearly as nice. Great balcony, bed was comfortable plus full kitchen. Perhaps best of all was the location. We were in easy walking distance of museums, Plaka, lots of shops and restaurants. Other than some confusion of over the entry code (solved by a very nice gentleman in the lobby who offered help and called up Alexi to get the right code), there were no hitches at all. Would absolutely stay here again the next time we visit Athens.
Also, a big thanks to Antonis, who offered to help us with the shower...at midnight! I turned down the offer and we figured it out in the morning, but I was impressed when he responded to my message within seconds despite the late hour.