and do facebook ads.You'll get far more reliable success.Want my recommendation for a Good website host, just message me!

Build experience and adjust.Some hosts use cleaning fees as a source of income.

I am thinking of co-hosting my rental in str/mtr.

Any market can work, you should consider a market that you have some 'competitive advantage' compared to others.Think of an area that you grew up in, went to school, visit friends / family, visit often, best of luck.Also, do you have any experience in rentals / short-term rentals.Air-bnb's hosts have become 'commercialized'.You will not out-perform a host who has years of experience, does this 24/7 and has a team of support.Best of luck.

I ask them not to book since there is cancellation penalty for hosts.

If so, what supersedes, the lease/rental agreement or the "contract" that host and guest agreed to when renting through Airbnb.

How many IFBB pros you planning on hosting

We are hosting a real estate meet up monthly in Barcelona and meeting a lot of people with the same questions and need of building there contacts. 

I told @Ian Pascua about a real estate meetup we host every first Saturday in Kihei. 

Your ability to execute on a good strategy and be a good host is more important than the market that you choose.