Great place, the pictures didn't do it justice. I took my mum here who is usually fussy about cleanliness etc and she loved it. Air conditioned, close to Monastiraki metro station, spacious and Dimitris was very friendly and helpful.
He has even included a coffee machine with ground coffee ready to go.
The only thing to note if you're a light sleeper wanting to sleep in is a church nearby with bells. I'd definitely stay again.