Absolutely lovely place to stay in Edinburgh. Close enough to sightseeing attractions to be able to walk (~20 mins from Edinburgh Castle and the Royal Mile) but far enough away that you're not surrounded by tourists. The apartment is located on a very cute street with shops, cafes, bars, and convenience/small grocery stores. We were able to get everything we needed to make two breakfasts, a packed lunch, and snacks within a block or two of Susan's place. There is some street noise if you're staying in the big bedroom that faces the street, but it wasn't ever a problem for us for sleeping.
The apartment itself is very cute and spacious, we were surprised by how big it was! Each of the sleeping areas felt very separate and private, and the living area was great for everyone hanging out and relaxing together. Susan left lots of great touches like chocolate bars, teas, spices, etc. There is a bin full of shampoos, conditioners, etc. for guests to use as well.
All in all, Susan's place was amazing and really exceeded our expectations. It was perfect for my three friends and I on our short trip to the city.