We loved our week-long stay at Theodore's! We have a young baby, so the quiet and convenient location right on the ground floor was perfect! It is a very easy tram or metro ride to Syntagma, and the Acropolis is even closer. Theodore also could not have been a better host. He helped us with all of our transportation needs and even went the extra mile with a crib for our baby and fantastic travel tips. It was the perfect spot for us.
The only negative thing that I would say is, because of the design of the apartment, the living room is in the kitchen, which doesn't leave much space for relaxing. That being said, it worked just fine for us. (And the tram noise is more of a rumble, which never woke us up at night or bothered our baby)