I had no issues with the room (which did have a lock) or the accommodation. Unfortunately, there was no shower when I was there (just the bath) due to repairs, which would have been helpful to know in advance. The Pentland Hills were lovely and nearby, and access to Edinburgh was easy as well.
However, I wished I'd noticed the other properties of the host - the house is effectively a boarding house; there were 3 other guests there at the same time as me. We all shared the same 1 (not 1.5) bathroom. I had the unfortunate experience of a very mixed bag of other guests, one of whom nonstop complained about easily solvable problems and made the stay much less peaceful than it would have otherwise been.