The woman in this incident was showing a house I believe... not knocking on a stranger's door to solicit business.

Do you really want your financial well-being based on free advice from strangers?

So much more friendly than a phone call from a stranger.

Strangers or not.I've never ran into a total disaster or anything. 

It turned out great for me those last 2 years as I became fast friends with my roommates anyways, but for international students with language barriers or someone less outgoing, it might have been an awkward arrangement.I'd try to advertise to groups of friends instead of individuals so at least you know your tenants should be able to communicate well with eachother and I think it kept us in check a little more than if it'd just been 4 strangers. 

How do you fair with other people, strangers?

I actually knocked on strangers' doors asking them if they were interested in selling their house, but no one owned the homes they lived in.  

What kind of life is it having, as some of our neighbors do, strangers come to clean their houses, clean their cars, mow their lawns, and wash their pets? 

Otherwise, stranger things than what you suggest can and do happen.

We were all strangers with a little picture on BP and just had our messages to communicate.