The flat is correct - but too loud for a family with kids, and a bit smaller than we expected. I personally does not enjoyed that the floor was/is sloping - but I am convinced that 20 years ago (at the age of 30) I wouldn't care about it. The location is great (in the middle of everything - another thing I enjoyed much more 20 years ago than now). So practically: it is great place, ideal for friends, young couples - but if someone plans a family travel... maybe not the best choice.
One more thing on the host: he (Isabel's husband) is a great guy, was helpful, we had a nice (half an hour long) chat when we arrived that I enjoyed a lot.