I stayed in Katie's flat with a coworker and his wife when we were in Edinburgh for a conference - the location is incredibly convenient and a good jumping off point to explore the city, or if you have obligations at the University of Edinburgh or any of the other large cultural institutions nearby. We found the place wonderfully cozy, clean, and well appointed. Checkin was very easy, super professional, and friendly! As other folks have warned, it can get a little noisy on Friday and Saturday evenings since it's right on the High Street, but it was pretty quiet the rest of the time. I would wholeheartedly recommend this flat to anyone as long as they can navigate the stairs.