A lovely apartment in a nice historic building in a beautiful part of Madrid. The neighbourhood is very pleasant with a lot going on, including coffee shops, pastelerías, restaurants and bars, but far enough away from the key tourists spots. It is also very close to Parque del Retiro - which is stunning and a great place to relax in the sun.
I stayed in this apartment for a month and it had everything I need for this extended stay. The three balconies were really lovely and the shared roof terrace was a real bonus with a cool view.
There is a building site opposite - but you are in the middle of the city, so this is hard to avoid. Just be aware of this if you intend to work from the apartment.