Had a fantastic time at this place.
My sister and I went on a get away weekend in July. Had no idea when we booked it, it was Pride weekend and we were in Ground Zero for all the Pride Celebrations. This brought with it all the fun of this and all the challenges of huge crowds all around at all hours of the days and nights. I can attest, however, this apartment was SILENT all night long. How, I have no idea when there were so many people outside on the streets and music pumping from clubs all around. But we slept just fine with not much noise pollution from outside.
We might have been aided in noise control by the fantastic air conditioning, however. Madrid was in the middle of a huge heat wave and we were able to keep that apartment nice and cool which I really appreciated.

As other reviews have noted, this an an attic apartment so the ceilings are a bit slanted. I'm nearly 6ft tall and at night had to be very cautious I did not bump my head heading to the restroom. I cannot imagine being a guy trying to stand and use the toilet. We were only there for the weekend and I was not at all bothered by having to slouch in parts of the apartment but for longer term, it might have bothered me.
There is a clothes washer but you must bring your own soap or purchase. Thankfully, I had seen this on other reviews and confirmed it before departing the US. I just packed a little soap powder with me and was completely fine. As for all other items, there was plenty of body soap, shampoo and dish soap so no worries there.
Bed was comfy. My sister slept on the couch for the weekend and found it very comfortable. An extra blanket would have been helpful and maybe it was there but we could not find. We bought extra pillows at the local IKEA for her.
Finally, I should definitely note that the check in process was, at best, interesting. They have a keyless entry system that in no shape or form would I have ever figured it out on my own had I not had our incredibly patient hostess on the phone with me making sure I got in the apartment. My code did not work that they initially sent and neither did the code they sent to my sister. HOWEVER, they could not not have been more responsive and faster in getting us new codes and once it was actually explained to me on the phone while I was standing out in front of the building and new codes entered, it was VERY easy to get in and out of the building and apartment for the remainder of our stay. The moral of the story is, bring your patience and make sure you have their phone number handy when you check in.
Overall, wonderful place, excellent location, great hosts. Highly recommend. Would stay again if in Madrid!