alt Hacker NewsOr, just throwing this out there, secretly list their own places and have robots clean up after the guests to evaluate -real places- that have -actually been used-. The key here though is that the places need to be theirs (or at least be a clear contract with the actual owner with full consent and understanding).
A robotics startup at this phase is unlikely to successfully clean an apartment. Usually it’s a lot more about data collection and training. Cleaning an apartment is very hard. The humanoid startup Figure showed their robot moving a few dishes from a nearly empty dishwasher to empty cabinets, and they’re an established company. Actually cleaning is very very hard and the systems are just not very capable yet.