The communication from Casa Develop was great. Normally, a response within the hour. The studio was very clean and the kitchen is well equipped. If you don't know Athens, you'd think the area is scary because of graffiti (which is everywhere in Athens), but I never felt unsafe.
I would suggest that those who are claustrophobic or extremely overweight not choose this place because the bathroom is extremely tight. I'm a small person and it was difficult for me to maneuver between the sink and toilet and get to the shower. The water from the shower gets everywhere, so prepare for that. On our last day, the bathroom smelled like sewage. Besides the bathroom, everything else about the stay was good.