I think this is a very good idea. I would also like Airbnb to include a rating in the guest profile scoring their response time to questions we may ask prior to accepting a booking. It seems unfair that hosts are strictly rated on response time and face penalties if we are not prompt.
I have had requests from potential guests and before accepting the booking have had to ask them a question. An example of this happened only five days ago. My apartment is in Central London. People visiting London not only come for business or a vacation but some middle eastern families accompany elderly relatives with a medical referral.
I received such a request recently from a gentleman bringing his elderly father from Saudia Arabia for medical treatment. He did not describe his father's illness but before accepting the booking I thought it only fair to inform him that there is a flight of stairs from the ground floor entrance leading up to my apartment. I was concerned that his father may be frail and unable to climb stairs. My response to his enquiry was 40 minutes after receiving his text.
Despite the fact that I sent him a special offer and pre-approval he did not respond. This is so inconsiderate and extremely rude. The dates become automatically reserved and one is waiting in vain for a response. There should be a shared code of rule and expectation governing both guest and host responses time. Each party should respond within a given time and face penalties if they do not comply.