I liked this flat for my two night stay in Madrid. The location is just outside the city center, yet provides easy access to all points of interest. The Plaza Mayor is walking distance, and bus and Metro lines can take you anywhere quickly. Although windows look out over a busy main street, insulated double panes reduce the traffic noise to a reasonable level. I heard almost no noise from neighbors in the building.
Furnishings are nondescript, but the flat is comfortable and absolutely clean. I found all of the utensils and plates needed for enjoying a few snacks acquired in nearby supermarkets. I did not cook any serious meals, but there appeared to be adequate equipment to do so. The washing machine worked well, and the air condition was a great benefit during an early heat wave.
Towels and bed linens were high quality, and the mattress was very comfortable. I rested well and will look to return here if available for future visits.