We couldn't be happier having chosen Carlos' studio for our holiday in Madrid. Although in a bustling area (30 minutes walk ins distance to any POI in the old city), the flat is very tranquil and perfect if you want to relax after a long day of walking. It is very clean and Carlos will provide you with everything you may need (shampoo, coffee capsules, even the fridge was stocked with snacks and drinks!). He was a text away and was regularly checking in to see if we were comfortable. I cannot recommend it enough!