The apartment itself is great, really nicely presented and everything you could need. Check in is a little complex compared to some, but the host's detailed notes made it easy enough.
However, the big thing to be aware of is that it's just above a series of busy restaurants/bars that make a lot of noise until about 2am. If you're planning to go out in the evening drinking or whatever and aim to get back in the early hours then this'll be a great place for you. If, like us, you had a busy day and wanted to sleep at a normal time then we found the noise to be a real problem and we slept very poorly.