We stayed in Valentina's apartment for a couple of days. Everything from the check in to communicating with her or her boyfriend worked out perfectly fine. The apartment was very clean and we had a very pleasant time living there.
The kitchen had all the basic equipment needed for cooking, which was very convenient for us as we like to cook most of the time. The balcony had a nice view into the very green and quiet courtyard.
The location of the apartment was very good, with the metro you can reach all the stations in the center within a couple of minutes, nearby were some grocery stores in walking distance.
All in all we had a really nice stay in Valentina's apartment and we can definitely recommend it. For our next visit in Athens we will most probably stay at her place again. :)