Sonder was basically an apartment/hotel. They own the entire building, and each room is its own little apartment. They have a nice rooftop, with lots of space for hanging out, and a gym; and they also have a nice business room on the bottom floor. I liked the location, we just had to cross Insurgentes (a big street) every time we wanted to get into Roma/Condesa.
The water went out a couple of times during our stay, for a few hours each time. That was not great. Sonder did compensate us for that inconvenience, so that was nice. The laundry room on the bottom floor was also nice, especially that it was free!
The weirdest thing for me was the fact that it was more of a hotel and not really an airbnb, as I had expected. It was fine, but it was just a surprise!