Very nice flat, well located between two metro stations, and within walking distance from several restaurants. Also the Kolonaki district is within walking distance (if you don't mind having a very short walk uphill).
Each room has its own bathroom, perfect for sharing with a group with slightly different needs (I am pregnant and it was good that me and my friends could independently set our pace/schedule as I might need some rest when they actually would prefer to go out :) ).
The third room has only a bunk bed, so it's good for children or a solo-traveller, maybe less optimal for a couple.