The host
Before we arrived, the contact with Ines was really nice. She reacted fast on any question and provided good information on the place and how to reach it. Upon arrival Ines was waiting for us (me, my brother and our dad) and welcomed us. She showed the place and left us with the remark that she lived next door and if we had any questions we could just knock on the door. And even though she apologized that her English wasn't perfect (still way better than our Spanish), communicating with her was no problem at all!
The apartment
The apartment is cozy and has everything you need. A kitchen with dishwasher, washing machine, fridge etc. Also Ines provided some coffee, tea, small cakes etc. Really nice. The living room is small but enough place to sit down. The bathroom is also not really spacious, but with a toilet, shower and sink provides everything you need. Ines provide towels and shower gel. The two bedrooms are nice, we slept perfectly. Also there is a small roof-terrace/balcony. The weather wasn't the best yet, so we didn't use it, but it must be great sitting there in the summer. Sleeping there with 6 (2 more on a sofa-bed) might be a bit much for the space...but since you're in the middle of Madrid, who needs to be in the apartment except for sleeping.
The location
The location of the apartment is super duper: really in the middle of Madrid, 3 min walk to metro station SOL, 5 minutes walk to Plaza Major, shops and restaurants everywhere. It really couldn't be better. And if you are afraid that there might be a lot of noise from the streets, being in such a central place...don't worry, the apartment is in a really quiet street. Absolutely perfect!
Would I go again?
YES!!! Ines is really friendly, the apartment offers everything you need and the location is absolutely magnificent.