We were a group of six friends and we spent six nights in Psaradellis apartment. The apartment has enought space for six people. The kitchen is full equiped and you won't miss anything if you want to cook at home (we were having breakfast and dinner there everyday and we had everything we needed). The terrace is also huge and even that we came to celebrate new years eve in Athens, the good weather let us enjoy it.
Stratis is a very nice guy! We had perfect communication with him all the time. He told us places to go for new years eve and explained us everything perfectly. He even drove us to the closes supermarket with his car (it's just 5 minutes walking but we were in a hurry to celebrate new years eve).
The only bad side from the flat is the area, I wouldn't recommend it to families. The area looks like a ghetto and there were a lot of homeless around, but if you go walking from the metro station to the flat (just two streets) there's no problem.