This location cannot be beat if you are visiting Madrid as a tourist. You are in between Puerta Del Sol and Plaza Mayor on a pedestrian side street. This means you can essentially walk to every major tourist activity or walk to the Sol metro stop and access the others. It was a cute apartment for a couple or 2 solo travelers. We were 2 solo travelers so it was nice to have the lofted apartment to get some privacy.
Some downsides - Wifi went in and out during the evenings/night. I had no data while there so it was a bit disappointing to have to work around a wifi signal. It was stronger in the mornings which made me suspect others were using the same Wifi.
Noise - This unit faces the garden and noise travels easily between units. So most nights we could hear other units conversations from open windows or water running from neighbors. One night somebody hosted a party until past 2 am which was unexpected. It is probably quieter than other locations in Madrid, but I would still expect weekends to be noisy if you need a truly quiet location.
Overall, we had a good experience here. It was clean, had the extra amenities we needed (towels, hairdryer, Wifi), and the location was perfect for those visiting Madrid for the first time.