We are very satisfied with our stay in Marinos place. The apartement is in a quiet neighbourhood but still close enough to the center of the city (we didn't need to use public transport almost at all). What we've found as an advantage was a supermarket and bakery nearby. The apartement itself is very nice, clean and perfect for a short stay in Athenes. It couldn't be any better.
The owner was very helpful and easygoing. He answered all of our questions and wasn't hard to reach.
I would definitely recommend the apartement and whenever I come back to Athens I would't hesitate to contact Marinos.