So my question is how can/should LPs verify the lip service GPs give on their experience and handling of this space? 

When a rental is taken out of service for personal use the accumulated depreciation goes away over a short period of time. 

Make sure to verify any information from a party that doesn't have any advantage of you getting their services before making a decision.  

When a PM does charge a markup, he's usually getting a discount on the service to keep the cost stable.

Think about questions you can ask to gauge the experience the professional will give you when delivering services.

I do keep getting newsletters from you every week.Your phone service always "takes a message" and no one calls back.What are you doing with my and other investors' capital?

Also, our virtual assistant service and their activities and processes we've perfected over the years creates a pretty massive pipeline of incoming deals. 

The courts will handle service via e-mail and delivery to the unit.

I would also look at the availability of public water and public sewer, if not at the site how far away are those services.

To name a few: lawn mowing business, marketing agency, video production company, acting career, window washing, SEO services, improv comedy, music production, painting, drawing, guitar, blogging, and photography.