Excellent stay!
The location can't be beat. Proximity to Monastiraki station made getting around town very easy, including from the airport. (Though, you really can walk just about everywhere if you're able) Surrounded by great food/coffee/rooftops/bars. The direct view of Acropolis was otherworldly.
The space is as advertised. You have the top floor - room, bathroom (which is right outside the studio) and rooftop. Perfect for a solo traveler. The building has an elevator, but you will still need to climb some stairs. The outdoor space is huge, perfect place to catch the sunset. The room is well equipped, including fridge, utensils, TV and lots of great local recommendations.
Communication was also great and made for a very seamless stay!