Ideal location, walking distance from Retiro Park with tons of restaurants and cafes. The flat was modern and very clean. The air conditioner worked perfectly as did the internet and water pressure.
The flat lacked a few customary amenities such as tissues, laundry basket, hard soap for showering. Great having extra pillows but no cases to cover them. The shower floor was very slippery and a potential danger. Maybe add a larger bath mat for safety. Also for light sleepers - heads up - the walls are thin and the neighbors can be noisy.
We love visiting Madrid but it was particularly hot this July so having the well functioning ac really was a welcoming luxury.