I stayed for two night while on a weekend trip in Madrid. It's a great budget hostel to stay at if you need a place to sleep for a night or two. They're straightforward about what they offer for the price. I wouldn't necessarily recommend it for longer stays because of the lack of privacy, though it really depends on one's expectations. Great people in the reception. One guy helped me with a problem with my locker without complaining or extra charges, even if the problem was my fault.