The apartment is well placed near the city centre, in a strategic position to visit the most important places in Madrid.
The house is instead quite small (more than what could result from the announcement) and not very illuminated, and also quite noisy because of the neighborhood.
Also, the cleaning could be better managed.
Overall speaking, it's a good and economic option as long as you are looking for an apartment near to city centre to spend a few days visiting Madrid, and if you plan to spend outside the most of your holiday.