We were traveling as a family of 6 and needed a place to stay the night before we departed for home. Yannis's place fit the bill just fine. Just a couple minutes walk from Neos Kosmos metro station, getting there from Piraeus port and then getting to the airport the next morning was simple and easy.
Yannis was very friendly and welcoming. He placed 2 bottles of chilled water in the refrigerator and about 6 juice boxes for our 4 kids. He also had 6 breakfast croissants in a basket on the table for us. Very thoughtful.
There are number of eateries nearby which Yannis has marked on a map for you. The metro is very convenient - it was about a 15min trip to Monastiraki station. Akropolis and Syntagma stations are even closer.