In a house with a lot of bedrooms, like you are describing, it is critical to have more than one full bath.  

I think it's absolutely critical to know those numbers inside and out so those concerns that you have can be considered and prepared for.

Response time is critical.

To avoid a repeat, you will do monthly inspections during whatever time of the year is critical. 

Its critical to find out their success rates in advance that will justify their charges even if its a charge for performance. 

 I saw this article that I thought was interesting if timeline is a critical factor for ADU projects.

To ensure success you will definitely want to associate with like-minded people, people with experience and who are already doing what it is you want to do, and people who inspire you… not naysayers, negative people, nor critics.

If you share the listing I'm sure you'll get some more critical feedback. 

That said, buying right will also be of critical importance.

I saw a lot of negative info on these guys but there are always critics.