So I need to have liability insurance for this flip I'm about to start as per my lender, wondering who you guys are using

And there is a lot of liability that falls on you.

Liabilities: massive differed capital cost as sludge accumulates in lagoon and then must be removed every 20 or 30 years, potential groundwater contamination from partially treated wastewater leaking out bottom of lagoon, huge amount of land required for lagoons (1 to 3 acres for 50 space park), inability of lagoons to remove nutrients (nitrates under new regulations), irradict / poor treatment during winter.

However not for the Bp forum- pros and cons of entity type, taxation, asset protection, liability, income, those working in the business and those who put money into the deal, buy outs, death, debt, who signs for debt, credit scores, divorce, partners relationships going south, etc. are some of the things that should be considered.  

Does anyone know if these (or any other companies) insure Airbnb on a farm since there are other liabilities on farms?

Personal opinion: An appraisers liability is limited to what you paid them.

So basically the best case scenario is you give the bank $40,000 (5% down payment) so you can pay $1500 month to live in an apartment (which is market rent) while exposing yourself to a lot of liability, work, and potential to lose some money.

If you create clear evidence, you need to be very careful about what you do when you show assets and liabilities on the loan application.

seem as though that would make you the GC. you gotta insure the project, liability wise. remember to protect yourself and protect the project.  

They buy the assets and take over the operations, maintenance and billing while mitigating your liability should something go wrong.