We really liked this place, the location was excellent and although it was right next to the main busy streets of central Athens, surrounded by stores, restaurants and people, you could not hear the noise from the studio! Konstantinos responded quickly and was very accommodating - he even let us stay until the afternoon on the last day, since our flight left late. Taking all this into account, we also consider the price to be quite good! The studio was very spacious and reflected what we expected from the pictures, while it was useful that there were plates, cutlery etc.
The only few things we noted: the bed that creaked even at subtle movements; there is no curtain at the shower which means you have to be careful with the water, but that's not such a big deal I think; and maybe keep in mind that the water boiler takes a while to heat the water. Overall though, the studio was new and accommodating and made us have a pleasant stay!