I stayed at Karen's place for an extended stay (three weeks) on a music residency and overall had a great experience! The best parts of the place are in its piano (which I used for teaching online), its beautiful neighborhood (surprisingly quiet at night), and the quirks of an older building and Karen's personal style. A lot of people mention the squeaks of the floor, but I got used to it within a day. The bathroom is largely remodeled and very relaxing for a deep bath!
I think there could be a few details that improve the overall place- some new linens, clearing some kitchen counter space and shelves for cooking and food supplies (for those staying longer than a few nights), and aerating as smells can really draft up from other apartments or outside. But really the place felt very home-like rather than a sterile box. For my longer stay, this was very comforting. I felt a part of the neighborhood!