Would highly recommend, it’s located in a cool, friendly neighborhood that is close to everything. Good wifi, a full kitchen with a washing machine and good a/c. The four flights of stairs are beautiful but could be tough if you have a lot of luggage, but not bad if you’re in normal shape (which you should be because of all the walking you’ll be doing in Madrid). Probably best for a couple, as it’s really a large studio but you could easily fit more. The shower does run out of hot water fairly quick compared to US water heaters, but didn’t bother us in summer. Staying here felt more personable than the hotels we stayed at in Barcelona and it was one of the highlights of our trip.