The flat is clean, well equipped, and in a great location just off a huge square full of restaurants and bars. Given this, the noise level was surprisingly low, especially on weekdays, because the building is set back from the main square with a pretty courtyard. The hosts were very responsive and replied immediately any time I asked a question, and any issues I had were quickly rectified in a very professional and efficient way.
One minor thing is that I stayed in early January and I did find the flat extremely cold - like a lot of Spanish homes, it's designed to keep heat out, not in, and it's interior facing so it doesn't really get any heat from the sun. There is an AC unit that can be used for heating and it helps a bit, but it's worth bearing this in mind if you're from a cold country with central heating - pack some slippers! Of course, this is only relevant during the coldest months and overall, I was pretty happy with the flat.