I stayed at Irene's place for a month, it was perfect for a long stay. There's everything you could possibly need in the flat and it's very quiet, you couldn't hear any outside noise at night, despite being in a busy area.
It's really close to the Acropolis and within walking distance to many great areas in the city. Irene was very helpful and went above and beyond to ensure I felt at home. I'd definitely stay at her place again!