Failure from the start! They didn't send the email with Unit or Key Pad code three days prior. Had to call / text to get this information on day of arrival on 11/30. Even worse, when guests arrived they were locked out. Called Host and told the Check in date was 12/1. Guests were forced to find hotel (3) rooms late in the evening and had to pay additional cost for this inconvenience. Followed up next day with Host and told "...your reservation and confirmed that your check-in date was supposedly November 30. Sadly, the extension date didn't sync to our system, which caused the additional day to be not updated." They stated "..process a refund on your unstayed night, which amounted to $241.78. I've rounded it up to $250 for the inconvenience." I expressed my dissatisfaction was told "sadly, I can only process an additional refund of $100.00. Please know that this decision has been made final by management. Thank you for your understanding!" Sonder admitted to error but no full refund!!