My husband and I stayed in Korina's apartment for 8 days, just left today! The location is perfect, right in the heart of Plaka; there is one large room, a small kitchen and a bathroom. Everything is brand new, Ikea style and very clean. Very close to everything we wanted to visit in Athens, walking distance to all archaeological sites, museums, restaurants in Plaka & Monastiraki. We did not have any problem with hot water, boiler etc., during our stay. Also, we did not have any chance to meet Korina due to her exams, but she was always available via emails and her cousin Eleni has been very helpful.
Highly recommended.