Katia is amazing host. Amazing! I booked last-minute and Katia was able to check me in at my preferred time. She is very respectful, intelligent and open-minded person, it was very interesting for me to talk with her (and she even invited me to share home dinner with her!). In addition to her perfect English, Katia speaks very good Russian and will be happy to practice it. And at the same time Katia of course gives privacy when you want, introverts don't worry :)
The guest room is bright, warm and quiet. There's a great view from the living room! All spaces are very (very) clean, kitchen is ready to use, coffee is available. Very good transport connection: metro entrance just opposite the building, and the center of Madrid may also be reached in 20-25 minutes by bus. Cozy and safe neighborhood with a lot of restaurants "for locals".
I highly recommend Katia's place and will definitely choose it again!