Great stay, super communicative and extremely helpful hosts. High quality interior, beautiful terrace.
Note that Exarcheia isn't the prettiest area in Athens (although one of the more interesting ones) and also that the noise of people chattering in the bars of the street downstairs is audible even through closed windows until about 1 am during the week and 3 am on weekend nights. However, we weren't bothered by this.
We appreciated how well equipped the apartment is and the very practical layout. Having heating & AC in every room is also a big plus.