Our 17 day stay in Martins apartment was excellent!
The location is within walking distance from everything you would want to see in Madrid, and also close to train station in case you want to visit places around Madrid.
The apartment is very clean, has everything that you would need and is very quiet.
There is a 24hr grocery store nearby, which is very handy too.
Martin had sent us a lot of very useful tips, which added a lot to our stay.
We would certainly come back!