Elena's home was very central and walkable (from/to city center and Atocha station). The room and common area were very clean. Check in was done through a key keeper, but it was straightforward enough. Checking out in the middle of the night was a bit of a hassle, as you have to first go unlock the front door, then come back up to leave your keys. It's not complicated, but I was self conscious about disturbing sleepy neighbors.
My main issue was that I felt that the host only answered to questions regarding check in the reservation itself. I inquired about a way to go to the airport early as there was no shuttle nearby at the time i was leaving. She just told me to look up the metro map. When I asked if it was possible for her to reserve a taxi for me then, she said no. I feel like it's just a courteous thing to do, booking a taxi for your guest. I did end up finding my way, but as a female traveling on my own, those little things counted.