Christina's apartment is fantastic! It is very spacious with 3 double beds, 1 twin bed, plus both sofas convert to double beds. All the double beds we used were comfortable. There are 3 bathrooms, two with a shower, and plenty of hot water. The AC works well, which was great since it was 100F while we were there. There is a lift if you don't want to take the stairs, but the stairs aren't bad (4 flights).
The location is the best part! Plaka is near Syntagma Square, tons of restaurants and shopping areas, and of course, the Acropolis and other ancient sights. There is a bus (X95) that goes to and from Syntagma and the airport 24 hours, so no need to even pay for a taxi. Everything else is accessible by walking.