Chris' place is fabulous!
Like all others have said, great view and balcony, no doubt. The apartment is indeed cozy and has everything you need. It's also close to many of the main sights, including of course the Acropolis, and is near plenty of markets and shops.
The host is very responsive and answered my questions in almost real-time, which was really great.
I've rated this place perfectly, so while the entrance to the main building itself is admittedly a little uninviting with graffiti and dim lighting (which of course the host doesn't have control over), DON'T let that put you off. The moment you enter the apartment/room, you kind of forget about all that since its decorated and put together so tastefully. It's just a "nice to keep in mind" about the entrance so that you're prepared for it on the first day of arrival and not thrown off.
Memorable stay, great place and great host. Go for it if you're thinking about a trip to Athens!