Mario and Noelias apartment is an absolute gem. The location right in the heart of the city, surrounded by the buzz of the plaza mayor is hard to beat. Groceries, medical stores, restaurants, bars are located close by. Convenient walk to the Sol metro station.
Apartment itself is quite spacious and well appointed. Spotlessly clean. Kitchen was compact and had all of the facilities (table top, kettle, dish washer, microwave, refrigerator). Everything exactly per the snaps. All of it worked smoothly.
The bedroom matress was comfortable, not too firm or soft. The master bedroom had a handy extension for storage, with a safety locker which was mighty useful. Single bathroom. Very clean, great shower pressure and consistent hot water.
Mario and Noelia were very prompt and considered in their responses. They have also provided for numerous guides and city maps, again a great touch. This would be my top choice for accommodation in Madrid.