This is a very good apartment overall. The location is very accessible and walking distance for a bunch of Madrid. The beds are comfortable and the apartment styling is very modern and has a “wow” factor. The kitchen has most of what you need for a short or lengthy stay. The washer dryer combo unit works very well and dries efficiently, especially for a combo unit.
That said, while the apartment is well appointed and has several nice amenities like the washer/dryer and dishwasher that can make your stay comfortable, the apartment was lacking a number of basics like dish and laundry detergent, hand soap, and paper towels when we arrived, and the coffee ran out on the second day of our week-long stay, so we had to purchase those things ourselves to make those amenities useful. There are several supermarkets within blocks of the unit so it was not a huge challenge, but it was slightly disappointing.
In addition, while this is a great apartment for most, there are a few things about the building and apartment that may not make it the right choice for some groups. For example, the shower in the “master” bedroom at the back is very narrow/small, which can make maneuvering in it a real challenge if you don’t have your own hanging shower caddie. The building does have an elevator, which is nice given the apartment is on the top floor, but it does not go the full height of the building so you do still have to negotiate up a half flight of stairs at both the top and bottom to reach it. There are also small half steps up and down from the street into the main lobby. While neither of these is necessarily unusual for Europe, they can be a bit of a trip hazard for older guests (my mother in law took a nasty fall coming into the apartment one evening) and so groups that have guests with limited mobility may find navigating these issues is more of a challenge.