Key fobs and other smart-access technologies make it easier for us to get in and out of our homes — but they’re also a privacy hazard.The old adage about the media is "If it bleeds, it leads". 

You have to walk from the living room through BR1, then through BR2 to get to the kitchen, eliminating privacy in both bedrooms.

With all the privacy data issues these days I wonder how easy it is for the tenant to look up the owners personal information. 

Most things like wage and hour claims, payroll tax violations, back taxes, etc. pierce the entity anyway.All that said, I use LLC's (and Corps) are good for protecting limited partners, outlining business structures, providing a little extra layer of privacy, etc.

It does depend on few factors location, price, how the house is positioned behind the other house (too close, doesnt get sun, less privacy etc) From my experience you will rent it out sure, but it will be on the bottom of the list for most tenants.

Therapists who sees patients like the privacy of the separate unit.

This seems like a serious infringement on their privacy.

I do want to comment on the LL that gets copies of his tenantsbills - i cant imagine thatis legal - seems to me that is a huge breech of privacy 

It's a privacy and security issue. 

Some states and provinces have greater privacy and keep the information in a private database.