Very well located apartment, close to major public transportation (train, metro, bus etc). Close to supermarkets. Just a few feet from the Sofia Reina Museum (which have free entry on their last two opening hours), same for the Prado museum that is in short walking distance.
The apartment is well equipped, and has a very good A/C that is very important during the hot Madrid days of the summer.
The only caveat is that it is on the 4th floor without elevator, but other than that very convenient.