We stayed in this hotel for a city trip to Madrid (2 nights).
Staff was very helpful and friendly upon checking in (all the more given that it was a last minute reservation) as well as during the rest of our stay. We had a business room, which was very stylishly decorated (blowup photo of Madrid as a wall) and disposed of all amenities (including a nespresso). Breakfast is served in buffet style and offers a decent selection of foods including several breads, danish pastries, cereals, yoghurts, marmelades, fresh fruits and charcuteries. Other items (eggs) were available at a simple request.
Also the location is very good. Especially if you're planning on visiting the museums, you couldn't pick a better location : the Prado is across the road, the Thyssen, the Caixa forum and the Reina Sofia are all just around the corner... The Plaza Mayor and the Opera can be reached by a pedestrian alley starting at the hotel... Metro stations (Atocha or Banca de España) are also at walking distance.
To give one negative critic : the spa and wellness section was a bit on the small side.