Pros: Fantastic location near the major museums and Atocha station. Great if you want to go jogging in Retiro park. Plenty of extra towels, which turned out to be a necessity (see Cons). Spacious common area and plenty of room in the kitchen for food prep. Dishwasher is a nice bonus. Wi-fi worked just okay for Zoom calls. There was plenty of storage space for my clothes.
Cons: There is basically no natural light in the room I stayed in (palm wallpaper) and noise is an issue. There is work being done on the lobby of the building as of Jan. 2022 and the jackhammering starts at 8:30 a.m. Someone else left the unit after just one night because they could hear the woman next door arguing with her son til midnight. The shower design is poorly thought-out: it has a "modern" design with half a glass pane, so water gets everywhere onto the floor no matter how hard you try to redirect the spray. We rotated through several towels trying to mop up after every shower and dried them on the heated towel rack in the restroom.