I spent only one night in Elsa's room. The place (room and bathroom attached) is very clean, with fresh towels and clean linens. Entrance to the bulding is secured, building itself is located in quiet and calm area quite close to main Madrid airport (Barajas). Elsa is living in the same appartment what provides additional securuty.
There are some nice restaurants near, serving mainly "italian" food.
Highly recommended for staying overnight.