It is a really nice place to live in the old town of Edinburgh. The location is fantastic. If you only have backpacks, it is just 5min from Waverley by climbing the stairs. Once you see the three red mail boxes, you get to Michaels's place. It is in the middle of Royal Mile and easy to get to every scenery spot (like castle, Holyrood Palace, National Museum of Scotland...) by walk. We lived there for 3 days in August. We could even see some of the Fringe shows from the apartment window. And sound isolation is good, so we slept very well. We also went to see Military Tattoo, so you know the location is very important as the show ended around 11:00pm.
Oliver met us and explained every details. There are one living room, three bed rooms, two bath rooms and one kitchen. And carpet is clean, so we can get rid of our shoes, wonderful! And they do recycling, so ensure you put the plastic, metal, etc. bottles to their recycle bags. And empty the trash as garbage truck is coming around 6am every morning. Sainsbury is nearby, so it's a good choice to cook dinner. Michael also offered us some fresh coffee beans which is one of the best for us coffee lovers. Oliver recommended some restaurants. One of them called Outsider (https://www.theoutsiderrestaurant.com/) is a must-go. We had lunch there twice, yummy!
Summary to future travelers: Michael's place is a good choice for you. Even the price is a little high during festival season in Aug, it saves your money/time in transportation and location is really really really convenient! And it is clean. Michael and Oliver are very hospitable. 5 star recommend!