Communication with Tamara was good, she replied immediately when I wrote to her. The flat is nice, three rooms that are rented separately and two balconies. I had the "blue room". Spacious for one person, everything you need is there. Light sleepers might be disturbed because the bathroom is next to this room, so if other guests come home late, there can be some noise, but for me it wasn't a problem. There is a kitchen, which is great if you want to cook or have breakfast at the apartment. The location is wonderful, a very short walk from the "Sygrou-Fix" metro station and also close to the Acropolis, so to see the center, you don't really need a metro pass. Near Sygrou-Fix you can find a bakery and some restaurants which is very convenient.
All in all, I enjoyed my stay and would recommend this place to everybody who wants to visit the center of Athens!