Andrew's flat is in an incredibly convenient location. Everything in Old Town is only minutes away. I only had a day and a half in Edinburgh and it turned out to be more than enough because everything was so conveniently located. I had everything I needed and he even gave me a great live music recommendation.
Being in the midst of everything obviously means it can be loud at night, especially on summer weekends. Also, it's clearly a bachelor pad as is witnessed by the kitchen chaos. However, it was clean and Andrew keeps the flat door locked at all times. (There isn't a lock on the door to the room though.)
Andrew was home the whole time I was there. His office/living room shares a wall with the room so it's a bit noisy (friends, TV, etc) at times but as I was out most of the day it wasn't a problem.