The location can't be beat. Caroline's place is right in the heart of Old Town, and within unbelievably easy walking distance to everything you could want to see - the Royal Mile is a block away, there are amazing restaurants no more than five minutes walk, and there's easy access to transportation.
The shower was hot and well pressurized. The kitchen amenities were easy to use, and there was plenty of space for my husband, daughter, and me. Check-in couldn't have been easier, and the lockbox was totally easy to use.
Fun fact, though, we did the City of the Dead "Double Dead" tour, which took us through the old vaults underneath South Bridge. The tour started directly next to Caroline's place, and surrounded it, before letting us out at the very top of Niddry Street. The tour itself was a lot of fun, but we were glad to have done it on our last night. Don't miss it!