BEWARE. Sonder's policies are incredibly restrictive and their team will NOT help you if you need to change your reservation.
When our travel plans changed the unit we had booked was available for our new travel dates so I requested a change to our reservation. I received confusing messages that said "we can help you with your alteration" but they never accepted the change. When I followed up I was told "space isn’t available for your new dates" despite those dates appearing as available on Airbnb as of now.
After all of that they had the nerve to try and sell me on a different property and a new booking. I responded that I was even open to staying in this other unit if they would transfer my reservation but was ignored.
Overall incredibly disappointed as the unit appeared to be nice but they were more interested in taking my money than providing reasonable customer service.