My partner and I stayed here during our 1st visit to Edinburgh.
The flat is in a great location as we were able to walk most places! Short distance to the Royal Mile, Grassmarket, museums, etc. It's close to Old Town but on a nice quiet street close-ish to the University.
The flat wasn't bad but wasn't great. Not a ton of personal touches to the place, and the amenities were pretty sparse. But I guess it was fine for our needs since we were out and about most of the time and only there to sleep. And maybe this is just a Scotland thing, but the apartment felt quite damp the whole time which meant our towels (we were only given one each) were always damp.
All in all, I think the flat was fine but improvements could be made to make the space a bit more cozy.