@Le1, here's a set of excellent links that will keep you busy for hours. 🙂
https://community.airbnb.com/t5/Getting-Started/Community-Help-Guides/m-p/23100#M190
It's essential to become familiar with the various aspects of hosting and with how AirBnB can help you.
It's also a good idea to type in your specific questions in the 'Search the community' box at the top of the page.
Many threads will come up, often with answers to the question you typed in.
Le, a few suggestions.
Use photos that emphasise the accommodation. Make sure they're bright and in focus.
No need to mention the couchsurfing information in the photo with the Czech guest.
Set a Secure Deposit. This will help cover any possible damage to the accommodation.
Change your cancellation policy from flexible to either moderate or strict.
Get rid of the Extra Guest No charge box.
(Go to settings, enter high amount, hit Save. When page refreshes, the box will be gone. [A fantastic tip first given here by another member.])
Create a clear list of House Rules so that guests will be aware of what is allowed and what is not, and what behaviour is expected of them.
Read through listings in your area to see what other hosts are offering, and how they are describing their accommodation.