The small flat was very well located along a pedestrian street near the Gran Via, Plaza de Sol, Plaza del Callao and subway/cercanias station. We did a lot of walking in the area and it still made sense to come home for a bit of a rest before heading out again. Location, honestly was great!
The flat itself was in an older building, filled with hostels on the lower floors. The flat was very spacious with everything we might need, including cups/plates/soap. It was also pretty clean.
Unfortunately, because it's an older building, there is a lot of wear and tear. There is (black) mold in the bathroom and ceiling. It's very common in older buildings but still unsightly.
In terms of cleanliness, it was quite clean BUT some missed spots on the walls and doorways - likely due to the number of people that come and go through there.
The double bed was comfortable but sagged in the middle. Also, the walls are paper thin!
Overall, a decent stay but I wouldn't come back.