This apartment was perfect for spending more than a few days exploring Madrid. We loved the location, air conditioning worked very well, shower water pressure was good, kitchen had everything we needed, and even though the area was hopping all night the apartment was quiet. We were running late because I got confused about the timing, but the hosts were friendly and accommodating.
I will say that this apartment would probably be better for one person than two. Double bed is already a bit small for two, and the memory foam mattress made it sink in the middle. Also the bathroom light makes the whole bedroom bright when you turn it on. We ended up sleeping on the fold out couch instead, which was more comfortable and solved the light issue.
I would definitely recommend staying here if you want to explore Madrid from a lively neighborhood.