A lot of the things we had issues with have been mentioned by others, but the flat was a good base for a long weekend at the Fringe.
The flat is spacious and in a great location about 20 minutes walk from the centre, just off Broughton St (which has loads of great independent restaurants, cafes, and bars). The street the flat is on is quiet though, and just around the corner from a massive Tesco.
The flat isn't super high spec/polished, and could benefit from a little love. The living room has two big sofas and the kitchen seemed well-stocked, though we didn't cook. Coffee and sugar was there on arrival, which was nice!
The few things that caused us issues were:
* the beds are creaky and very uncomfortable. You could feel the bed slats through one of the mattresses and on one half of the other. As another guest mentioned, the pillows are also quite thin (one bed has nice thick ones though)
* the towels provided weren't adequate: One bath towel and four hand towels between four of us
* the hot water wasn't working on our first morning. No one from the flat (owner/agency) was particularly prompt/helpful and we ended up finding a tripped switch in the fuse box in a storage cupboard to get the boiler back on. More sympathetic communication from the emergency contact would've been nice here, but at least you know how to fix it if it happens to to you
* parking is VERY expensive nearby and there are only a handful of non-permit spaces on the street. Something to bear in mind if you're looking for convenience
All in all, we loved the area and the space the flat offered us, but probably wouldn't stay here again unless a few things were improved.