We stayed eight nights in Inger Lise's apartment and it was lovely! The location could not have been better, right on the Royal Mile and in the center of everything! The bed was comfortable, the shower had great pressure and hot water, which was perfect after walking all day in the chilly Edinburgh weather. The apartment had everything necessary for cooking meals while there as well and was within only a few minutes walking to grocery stores.
While the location is spectacular, that does come with noise at night. If you are not a light sleeper or don't mind sleeping with earplugs in, this place is for you. There were a few places that we felt could be a little bit cleaner in the apartment and unfortunately the fire place didn't work while we were there but I know they are getting it fixed. The stairs were not a problem for us at all, but I could see how some would have an issue with this as there were quite a few flights to climb.
Overall I would 100% recommend staying here and would most definitely stay here again.