All the best to you.https://www.fanniemae.com/content/guide/selling/b2/1.2/03.html

Do you charge them the cleaning fee separate or incorporated with their charge for the whole stay? 

It would be a way for BP members to stay on BP and create amazing connections instead of moving over to that other "unhappiest place on the web" FB, where they do have private groups.

Here are some recommendations for you:Find and connect with other BP members that are in your area: http://www.biggerpockets.com/meetSet up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsRead Beginner’s Guide: http://www.biggerpockets.com/real-estate-investingCheck out BP Podcasts: http://www.biggerpockets.com/renewsblog/category/podcast/Wishing you the best!

Here are some recommendations for you:Find and connect with other BP members that are in your area: http://www.biggerpockets.com/meetSet up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsRead Beginner’s Guide: http://www.biggerpockets.com/real-estate-investingCheck out BP Podcasts: http://www.biggerpockets.com/renewsblog/category/podcast/If you wish to tag someone in the conversation on the forum, type @ followed by their name and then select the name of that person which should appear below the comments box.

Also I remember Ferris saying he was inspired by the book Vagabonding: An uncommon guide to the art of long term world travel.

Is there anything to guide me?

That is good to look at as you can see they health ratio for them personally and their businesses.If the lease does not disclose sales another indicator they are staying is if they just did a big re-image or update or added a lot of new equipment to the inside of the space.

Some states have common law marriage , after so many years and kids , they could consider you married .Safest thing ....................stay single and keep it zipped up 

You should also start by reading the Ultimate Beginners Guide that is offered here through BP.