The apartment is like 20-30 minutes walk from all the main attractions in Athens so we actually walked everywhere which is pretty convenient but is also close to the metro station and there's taxis everywhere around.
Mary and Theo are a really nice and gentil couple. The communication was really good and we didn't have any problems to check in, they were waiting for us and they even let us leave our bags in the apartment after the check out so we could get around the city before our departure.