We stayed at Stravros' place for about a week, and had a wonderful time. To quickly summarise things:
– The flat: The pictures honestly don't do the place justice, it looks stunning in real life! Very spacious, modern appliances, and obviously renovated within the last ~10 years. It is located on one of the upper floors, so it is very quiet. To overlook the surrounding area one can step out on one of the four (!) balconies. The place is also outfitted with three AC units, one for the living room/kitchen area and one for each bedroom, respectively.
– The location: The flat is located around a 20-minute walk from Monastiraki, which I would consider to be the city centre as far as tourists are concerned (most of the well-known monuments and many bars are in this area). There's a big supermarket (ΑΒ Βασιλόπουλος) with all the essentials just 5 minutes away. There are also two metro stations relatively close by, but we rarely used them and just walked most of the time. The metro station coming from the airport (M3) is about a 15-minute walk away.
– The host: Although we didn't meet Stavros in person (we were in Athens during August 15th, a big holiday), all interactions with him were very pleasant. He would respond to messages very promptly, even at late hours, and was always enthusiastic and happy to help. He was also very accommodating when our travel plans changed due to a cancelled flight last-minute, which made our lives much easier!
All in all I highly recommend Stavros' place, and would love to come visit again.