The apartment is a lovely little apartment with a big terrace in the Bellas Vistas area, a high density but very quiet part of town. The building is a very secure building and has an elevator. There are supermarkets and a range of shopping/restaurants just minutes walk away. The apartment was very well equipped with all those things in the kitchen that you don't want to buy for just a few days, herbs, spices, detergent etc etc. The bathroom was clean and well functioning (though a loose toilet seat come to think of it), but my wife couldn't finish washing her (huge) hair before the hot water ran out ;-). The bedroom was clean and tidy and the bed was soft.
The owner had changed the internet router to a new one and forgotten to update the checkin details with the new name and password, so we had a couple of hours without wifi till the manager responded, but otherwise it was a very very smooth stay. Everything else, washing machine, kettle etc all worked very well and did their job just fine. Parking however near the apartment is quite difficult, it is a green zone and limited daily to just a few hours, there are parking stations around, but more than 30 euro per day and you need to give up your keys (must speak Spanish to use the parking stations). If we did our time again we wouldn't rent the car, just get a taxi/uber from the airport and you can walk everywhere else.
About 200m away is Green Coffees (google it) - english speaking - with fantastic coffee, great food and a wonderful attitude to life. Opens at 9:30am and great place to start your adventures around Madrid while staying at the apartment.