My wife and I had a wonderful stay. The building is well-located. It is a 10 minute walk to the edge of Edinburgh Castle and most attractions clustered around the Royal Mile are also in walking distance. The Airlink stop at Haymarket is also close by, so we could arrive easily from the airport.
Maureen and her husband are first-rate hosts. They were friendly, and fun to converse with in the morning or when we returned from sightseeing at the end of the day. They had several good suggestions about sightseeing as well. (one somewhat obvious one: book castle tickets online a day ahead).
The accommodations are nothing extravagant but they are clean and comfortable. My wife and I felt quite safe in the neighborhood, and the building itself.
Definitely worth a stay.