This is a small but comfortable apartment in a SUPERB location between Tirso de Molino (slightly uphill). and Lavapies (slightly downhill). Very convenient for everywhere in the city, on foot or by Metro. Good wifi, good aircon, plenty of hot water, soap/shower gel and shampoo available. Double glazing (that fits well and closes firmly) keeps out much of the inevitable late-night Madrileño street babble etc. It is let by a company, but they are friendly and helpful and easy to contact. I had no problems, but if I had experienced an issue I feel confident they would have been quick to respond/help.
Check-in instructions (emailed) are very clear. Worth bearing in mind: because it’s not let by an individual, the kitchen shelves are completely bare - no salt, even, which is a shame - although there are enough cooking/eating utensils (just). If you’re just staying for a couple of days, like I was, getting to a position where you could cook almost anything would be expensive and (if flying) wasteful as you’d have to leave most of it behind.
Having said all that, the excellent location makes up for the slightly ‘clinical’ nature of the apartment, and if you like Indian food, you’re in luck because there are any number of Indian/Pakistani/Bangladeshi restaurants within a 10 minute walking radius, with prices at every level.