Max's place is right in the central part of Madrid. Its within walking distance of all the tourist attractions(within 30 min). We never used a Subway or bus. Max showed us his favorite parts of the city during check in which was very helpful.
The apartment was nice with a kitchen and plenty of room to breath.
It has a beautiful courtyard in the center apartment building. The building is very old and once functioned as part of the church.
I would not recommend to anyone with a bad back or sleeping issues. The bed may be a tad small and hard, bring your own pillows. We were fine though and slept all through the night.
In short is was a wonderful place to stay. It felt like having your own place in Madrid. If you have a choice between this and anywhere else...choose Max's