Cristina's place was in a very convenient location. It's a couple minutes to Atocha station and rental cars. It's also close to the Reina Sofia if you're planning to see Picasso's Guernica and just a little further to the Prado. The park is nice and of course you can easily taxi or uber.
The place itself is comfortable for one person or a couple. Great AC and very stylish. Comfortable bed and plenty of plugs for you to charge multiple devices.
Very fast communication from the host both before and after the stay. Thanks for hosting!