Do you recommend making relationship with property management companies?

Make sure to communicate your BRRRR strategy with your insurance agent so they can recommend the right coverage for each phase.I learned this lesson the hard way: https://www.biggerpockets.com/forums/853/topics/1222933-my-b...

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

I would not recommend RESimpli to anyone else.

Have you invested in any of these areas, or do you have others to recommend?

If the guest feels slighted, there is no fact checking service provided by AirBnB to confirm their claims, so it is up to you to let future guests know the level of professionalism you provide.If you are able, I would recommend editing your response to the 1-star review.

So, your focus may need to pivot from high rental cash flow to little to no cash flow as a rental with an appreciation upside.I would recommend taking your $150K to $200K and securing a solid equity position in something that will cover its expenses and maybe provide a small cash flow, but then is poised to appreciate nicely over the course of the next several years. 

For starters, I recommend to begin with a single family home or if you are looking to start locally, do house hacking. 

FYI, we were able to get a 5.5% rate from their recommended lender with 20% down.  

Quote from @Brandon Croucier: Hi Kathy, at the end of the day the mortgage industry is so vast & wide it's essentially like trying to navigate the Sahara Desert.I highly recommend working with an experienced mortgage broker who knows the ins and outs of the industry to place you into the most competitive product for you.More times than not, people save money working with a small shop broker.Kathy,I wanted to revisit this to offer a a tad bit more and Brandon above is correct.