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

That could be market knowledge, ability to rehab a property - something that can give you an edge over other experienced RE professionals in the market and asset class you are working in. 

Readers should seek professional advice.

I guess I need to figure out a professional way on how to market to them.

Check with a great tax professional!

We managed to navigate it, but it was a lesson in the importance of understanding both federal and state regulations.Given your location in Boston, Massachusetts, it's especially pertinent to consult with a qualified intermediary or tax professional familiar with both federal and Massachusetts state laws to ensure a smooth exchange process.

They have professional photos, all above 4.8 stars on Airbnb. 

We had just listened to a podcast with Marco from Norada as the guest (Passive Wealth Strategies for Busy Professionals: Demystifying Turnkey Real Estate Investing) and were reviewing the information about the notes on their site.

Although Philadelphia is only requiring you to get General Liabilty, I think you have a bigger exposure to Professional Liability (E&O) insurance. 

@Richard Schubert are you having these professionally inspected before you buy them?