We like Homejoy and we use their service with some of our customers.
The problem is that this isn't a complete solution and even though it is the sexy part it's not even the most time consuming.
We would like to offer more holistic solution, which includes even things like sending you photos of the flat after check out so you're sure your flat is OK and nothing is missing.
Plus we would take care of liaising with guests etc, so it's less hassle for you. All you would do is just approve guests in airbnb.