Staying with Laura and her brother was a good experience. The flat is a little small for 3 people to stay in, but it worked for me. It felt more like I was living with them, like they were my flatmates, rather than a Airbnb guest/host dynamic. I got along with them quite well.
The bedroom is great, clean and very comfortable bed - a rarity with Airbnb rooms. Also, the room had natural light which seems like a luxury in Madrid, that was important for me.