Sol was a terrific host, she got back to every inquiry quickly and went the extra mile to make sure our stay was great. Her place was very cute and clean and had everything you'd need for a short stay. Loved that her place has AC (it was 35 degrees when we were there) and the location cannot be beat, we were just a few minutes walk from many top sights in Madrid. Also loved the Nespresso machine.
The only downside to us was the low ceilings - being on the top floor with the roof slant, we both had to duck in several places (I'm only 5'5") and we both hit our heads at least a couple of times until we got used to it. The bathroom (shower in particular) is *really* small (which is typical in Europe) but it could be quite annoying to someone really large or tall.
The apartment is also 3 long flights up with no lift, not an issue for us as fit people with backpacks, but anyone travelling with rolling luggage or anyone with mobility issues would have a hard time with that.
Overall, I loved staying at Sol's and would 100% book it again if ever back in Madrid.