Very nice apartment that is located in walking distance of the city center. Everyhing was very clean and modern. The kitchen was basic but sufficient. Only an electric kettle would have been fantastic.
The only thing that differed from the description was the bed: The bed was about 190x140cm, which I wouldn't call a large double bed.
Also a bit annoying were the frequent automatic messages from the management company for the apartment. And we had to go to the reception every ohter day because our key card stopped working.
But all in all it is a great place to stay in Madrid and I would book this apartment again.