I liked Martin - he was very helpful and attentive and easy to reach. The location is excellent and the room was clean and comfortable.
However I think the description of the space is not really accurate. A fourth floor walk up with no elevator, covered in construction dust with ladders and paint cans in the hallway, is not the same as a "penthouse."
Also, this is beyond his control, but you should know there is a faint smell of cigarette smoke that comes in from a neighbor or maybe the roof. It's faint enough to not bother me but if you're super sensitive you should know it's there.