Glenn's flat is really nice and was very clean! The location is very slightly outside of the centre but is only about a 20-25 minute walk or a ~5-10 minute bus in a straight line right into the centre.
The flat itself is very stylish and easily comfortable for 4 people. It's in a quiet area which is nice during particularly busy times of the year (e.g. the Fringe).
Check-in and check-out were straightforward and Glenn was proactive to provide all the information we needed ahead of and during our trip.