PROS : a good size apartment with lots of shops and restaurants close by. Quiet that is quiet at night night.
CONS: not a place you would want to spend more than a few days as a bit depressing with cheap furniture, slow internet and lots of little things that show a general lack of care: several things broken, only a few old coat hangers in the wardrobes, half eaten jars of food in the cupboards, etc. Most good hosts also include instructions on how to use the appliances and TV, and a list of nearby supermarkets and restaurant recommendations. I think it shows that Carlos no longer lives in Madrid and has someone else handling looking after his apartment.