I stayed in the apartment for 5 nights, and I loved it. It is a very cute studio apartment. It was clean and full of light. Dim and his wife were very responsive and answered quickly to any question I had.
The location is just perfect - its on the middle of Psyri, right above plaza Iroon (but the apartment is quiet).
The building is a little bit old but the apartment is renovated.
In short words - absolutly great!