In terms of the apartment, it was hotel quality. Extremely well maintained and cleaned to perfection. The fan does a great job of keeping the place cool and the little Juliet balcony is big enough to stand on and take in the city. Arturo was great and every instruction was very clear. Check in was great and using the digital key to get in the door was actual fantastic as you weren't worried about losing any keys!
The apartment is right in the centre of Madrid. You couldn't be more central, you are a 5 minute walk into Malasana, a 5 minute walk to the palace and 20 minutes down to a lovely area like La Latina. Being so central means the surroundings of the flat are very lively and a real buzz. You are definitely in the touristy area but you cross the road to Malasana and immediately feel like you are in true Madrid. It still felt safe and secure. There is a metal shutter you could close on the balcony that meant you could block out street noise very well at night and we barely heard a thing. A light sleeper might need ear plugs. Bed super comfy as well.