Nikitas is really easy to communicate with, very concise, and cares about the experience.
The center is easily reached from the apartment. It takes about 15 minutes to get to Syntagma square from the apartment. By foot, it's about 35-40 minutes.
There are many shops in the neighborhood, and a park with a lot of cafees and restaurants is just a stone's throw away.
Also, the Archaelogical Museum is just around the corner (10 minutes on foot).
The area is very nice, quiet.