I dont have a good suggestion for you - last time I encountered this situation, the negociation was done through the title company's attorney.

Get enough thinset material to apply under the backer board with at least a 3/8" notch trowel, and nail or screw the board down as instructed on the stickers found on the material.

I would love to hear what you use for running your comps and if you encounter this crap often as well. 

Most if not all have this but to answer your question, yes there are fees (in general) to set up an account and other fees like maintenance, wiring money (in/out), that you may encounter. 

Even if you choose to manage the property yourself, you should still account for the costs (e.g. gas, time, etc.) associated with it.As a landlord, you can expect to encounter your share of surprises, but there is no need for expenses to be one of them.

It's not right but I've encountered a lot of situations like that.The other types of tenants will be the ones you'll want to get rid of.

So, so far (as a landlord for 2 months) I've encountered bumps in the road already but have rectified them quickly.

Search the BP for ADU appraisals to encounter numerous examples.

Because it takes repetition for people to remember things and you have to be top-of-mind when they encounter a potential client for you!

This is absolutely the best place to post questions - there is an amazing community of folks here that you will encounter - lots of knowledge, experience, and some really great people!