This apartment is a wonderful location for a couple looking to stay in Madrid for a few days to explore the main sites the city has to offer. It is off one of the main streets, and next to a main tourist plaza, so everything you'd want to see is within reach. It also is accessible by metro, which is helpful.
The apartment itself is extremely clean, has everything you'd need (fridge, oven / stove-top, towels, shampoo, ironing board, etc). Enrique and Jorge are great with communication as they respond back to all messages regarding questions, tips for exploring Madrid, etc in a timely manner.
Definitely worth a stay here. The only thing I will mention (which wasn't a problem for me, but...) is that the bed is a pull-out couch. Pretty comfortable, but if that's not your thing, maybe not the place for you.