I don't know Mexico City, so I can't really comment on the location, and I ubered to everything that I needed to get to, but the street itself seemed safe. You go through three locked doors to get to the back room, so you definitely feel safe once you're back there.
The spiral stairs are better for people who are in shape and have a small amount of luggage.
Very comfortable bed in a simple room. It was extremely cold; I had to sleep in my clothes, fleece, and socks- but it was quite cold outside too.
The shower was nice, the water was hot. Bring your own shampoo, conditioner, soap, blow dryer, etc. A towel and hand towel were provided and a second towel was provided once I asked. All in all, a good bargain if you need a comfy bed to sleep in.