This apartment itself was very nice, perfect for our 3 nights in Madrid for a few reasons - primarily the location. The apartment had everything we could possibly need, no issues there.
We did experience quite a lot of noise disturbances throughout our stay however. The apartment has thin walls, but additionally on the 2nd night from about 5am a large group of people were obnoxiously drunk singing in their neighbouring apartment after coming home from a night out, this lasted for a few hours - I would have told them to STFU if I knew where they lived. I had to put in earplugs. The next morning at about 7:30am, construction work started downstairs which completely rattled the building and thus led to a rude awakening. I can say these were probably extenuating circumstances, but they did negatively impact our trip!