AirBnB Newbie Looking for Advice on 2nd property

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So I recently purchased a dual home - I live up top and rent out the bottom. So far it's been working great...covers my monthly nut so basically living for free.

Right now I have about $360k left at 4.3%

I have about $170k in cash

Was thinking to use some of the cash to either invest or perhaps pay down some of the mortgage

But...this sweet house for $650k came on the market - it also has a main living area and a carport that can be rented out for $1500/mo or so.

So I'm thinking if I deploy 20% into that I can live in the 2nd house and the cashflow from the other house + side rental should cover it all.

Do you think this is a good idea or given how hot the market it is would it be safer to just pay down the first mortgage first?