I truly loved the very little of Athens I saw. Whenever we come back we'll stay at kostas' again without a doubt. The only thing is that I will not take my kids with me as I realised there is a lot of night life in this area and I didn't get to see it.
The views from the rooftop terrace are stunning, especially at night.
The flat is cozy, perfect for a few days in the heart of monastiraki. It has all you might need, air con, fan, etc and the kitchen in well equipped.
We didn't get to meet kostas because he was on a trip but we were welcomed by Magda and yanis, two very nice people who helped us out with the luggage, gave us good tips as to what to visit and about local restaurants. They were genuinely willing to help and we really appreciated that.
The building itself might be deceiving as the entrance and the stair case look a bit anarchist but the flat is tidy and very clean.
We recommend this studio 100%