My stay did not actually occur, because we were were unable to get through SONDER's complicated online booking system. It demanded that we upload a photo ID (passport or driving licence).
People who travel within the UK do not carry their passports around as matter of course, and nor is it a legal requirement to carry one's driving licence around. By making this a mandatory part of the booking process, SONDER has made things difficult for UK customers like us.
SONDER's website was cumbersome, slow and intermittently non-responsive during the process so that several times we lost the connection to the website. We checked that it was not a browser fault, that there was sufficient signal strength, and other websites were responding quite normally when we opened other tabs on the computer. It was a problem specific to the SONDER website.
It is so annoying that they operate within the UK, and yet do not have any staff present in the UK, so that when one contacts their Help Team, you get put through to the US or Canada, where the persons taking the call have no clue about England, and the local hotel, and are unable to provide any meaningful help, other than to make some feeble responses, and utter some sympathetic mumbling noises.
It is probably too much to ask, and to expect, that the company's senior staff and senior management would take any notice of this review, or that their Web Manager / Website Team would make any attempts to improve their substandard system.