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.

Networking with other investors and professionals is crucial for learning and finding opportunities.

Understanding the tax benefits of pre-tax contributions, cost recovery, real estate professional status, legacy goals, etc are all part of the equation and should be considered. 

That said, I do this with a a few investors on rentals since I'm a Realtor and Property Manager where I am boots on the ground for purchase, rehab and lease-up, however we had a strong professional experience/life together before partnering.Lending will also be a consideration as most lenders are hesitant to lend to non-citizens given the foreclosure challenges it can pose.

Respond quickly and professionally to inquiries to show you’re reliable.Leverage Airbnb's New Listing Boost: Airbnb often prioritizes new listings in search results for a short time.

Unless you use a local professional familiar with the market, who you trust, best way to know a good deal is to study the market.

Just be mindful of the following things when it comes to California.California does not recognize Bonus DepreciationCalifornia does not recognize real estate professional status.Therefore, you can potentially reduce your Federal taxes but not your California taxes.

Or diversify with a ten unit multi professionally managed.

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

The reason you would hire a licensed professional is to assist with you not gettting SCAMMED and help you with negotiating prices and terms...based upon State Law.