I can highly recommend this place and would come again any time!
We were a group of four people and stayed at Yannis' place for 12 days. The communication was excellent the entire time. Very fast, very friendly and he provided us with everything we needed. He also contated us in between and asked if everythins is fine and we need anything which was really nice!
The apartment offers everything you are looking for! Very nice furniture etc, the balconies are amazing with lots of sun all day long and everything was very clean!
The location is perfect as well. Not as loud as in the direct centre but with lots of nice restaurants, bars, cafes etc. just around the corner. It is also within short walking distance to the Acropolis and the city centre.