After a 3 night stay in this apartment, I am able to point out positive and negative things. On the positive side, the apartment is very well decorated, confortable and very clean. Also the communication and check in is quite easy and fast, they reply to all necessary questions.
On the negative side, only 1 thing but very important at least for me, travelling with family. This apartment has no sound isolation, zero, making it very hard to have a good night rest, its almost like the cars and people in the street are inside the apartment, you can even hear the conversations in the street without any effort.
If the plan is to enjoy Madrid night, this can be a nice place but if you go with family and want to have a good night rest, no chance.