You have no authority to force him to let her in.  

The state has far more money, time and authority to pursue these kinds of matters.

*Be aware that you are not allowed onto the property without permission by an authorized representative or agent.*4.

Become an Authorized UserAsk a family member or friend with good credit to add you as an authorized user on their credit card.

In the second state, the municipality by law had no authority to change anything and the one meeting with them was advisory only. 

For the most part, they should pay for any penalties from the tax authority but at the end of the day, if you weren't paying for the taxes through escrow, and they weren't disbursing to the tax authority, but now you are and now they have, it makes sense the payment went up because they are covering the shortage for the period you weren't paying.

If someone connected with you has signing authority, you can be found via that connection. 

Anyone that has ever read or communicated with a city, county or public regulatory authority can attest to the often frustrating and unclear answers that are received (think DMV) but multiply it by twelve when it has to do with sometimes illogical or biased short term rental permissions. 

I've recently started using Intellirent.com for screening, as it further automates the reference checks (only works perfectly if the employers and former landlords respond), but it includes an authorization form (electronically signed by the applicant) that you can download.

I don't know what you signed with the broker or what expectations were reduced to writing, I only know that IF you wish to have an open house and they refuse, and such authority to refuse such a request is not provided in your listing agreement, then you should have the right to terminate that relationship.