This listing is in a great location - its proximity to a large transit hub (Moncloa) means you can get around the city quickly. The neighborhood has lots of bars, restaurants, and places to shop. New insulated windows do a great job keeping sound out. The apartment was well equipped (coffee machine, washer/dryer, heating, etc).
The downsides - common areas look like a newly converted office. It has a waiting area with a law firm logo, and the dining room table has law office furniture, and lots of office clutter and down not make it feel very "homy". The living room furniture also was underwhelming for the size of the apartment (a small couch and two chairs). To be fair this is accurately portrait in photos, so you get what you see.
Bathrooms: The main suite shower was very unpleasant to use - shower head moved around, and the retrofit curtains moved into the shower area.
Linens: The sheets and pillows looked very worn out and old.
These area easy fixes and I hope host can fix them