Landlord is responsible for roof, structure and common area maintenance (costs of which get reimbursed by Tenants)Of course, leases can have variations of the above.

Some variation of this question comes up in the forums pretty often, @Jack B.

Good evening,I am a newbie to this world (although I was around the move and flip market as kid via my parents) I am very green to the real estate investing market and after any advice to grow and learn.I’ve done my basic research/learning (books/podcasts) in the single family rental marketing and their different variations of investing the past few months to see if this is something that I would like do.

But even then, there are going to be variations beyond that. 

Figuring out your expenses is more difficult with this type of property, than with multifamily, because there is wide variation regarding which expenses the tenants pay themselves or get charged back for, and also what services you are providing. 

@Jose Furman, I agree with @Zack Karp There's a ton of variations and lenders both conventional conforming and private or portfolio. 

Typically it is going to cover the properties structure and exterior, but there is wide variation in what else could be covered. 

Due to these factors, an extreme variation in the U.S.

With the virus around I'd imagine that people will be wary of Airbnb's due to variations in cleanliness and veer towards conventional hotels.

If the duplex has one electrical meter then one person pays for all of the usage, and the only way to recoup that is to use a bill-back system in which each tenant repays a portion of the electrical usage (or a variation of this idea).