Marcos's place is a great little attic apartment, perfect for a stay in Madrid. It is a block from the Plaza Mayor and right in the middle of everything. There are people out late, but it was quiet enough to sleep with the windows open. There is a grocery store on the next block and great restaurants nearby. I was there for business just outside of town and could easily catch the Metro or Renfe train at the nearby Sol station.
There is no elevator, so be prepared to take the stairs all the way up.
The apartment was very clean with a very nice nice bathroom and shower. The bed was very comfortable. Because it is an attic, you need to be a little cautious when you walk near the dormers. The small clothes washing machine was very much appreciated! There is no dryer, but there is a drying rack that worked fine.
Marcos's wife met me at check in and both of them were very friendly. The communication and check-in was easy.
I highly recommend Marcos's place!