Ifigeneia's apartment is very very nice, very well equipped, the decoration is very pleasant, it is very big (2 rooms for the living room + a TV corner, 2 nice bedrooms + washing room + fully equipped kitchen), quiet and comfortable (the most silent air conditioning I've ever seen), it was very nice to cool down after the heat of Athens in July. We spent a very nice time!
The archeological museum is just 50 meters away, there is a very nice square with cafés and restaurants just around the corner; to reach the centre (Monastiraki), it's a good 15 minute walk (with an 8-year old kid).
We'll definitely keep Ifigeneia's apartment in mind for our next stay in Athens!