Sonder's building is a very good, reliable option. Be aware of its pros and cons, though:
Pros: very clean, well-stocked apartment ran by a reliable company. Sonder staff is always available to make your stay better. The check-in, app and amenities are good and well thought out.
Cons: the location is good (right next to Condesa and Roma), but the actual street the building is on is a bit chaotic. The building is next to a hospital, so it does get noisy (Sonder staff are aware and provide you with a white-noise machine and earplugs). The apartment's room has AC, but the living room does not and can get quite hot.