Document everything.I just had a guest at a property that I manage ask for a full refund for a stay he booked last minute, ignored paying a pet fee, ignored my request for the pet fee, asked for an early check in.  

Will you have to how a property manager or are you capable of managing it yourself? 

I have a local property manager that is co-host on the AirBnb listing that will continue to manage the property.

One is relatively new and other one is quite old. 

Can anyone recommend companies who manage these types of properties?

But, managing them can be a lot of work.

On the flip side, multiple MTR/STRs in other areas could yield higher cash flow, especially in tourist-heavy or affordable markets, but managing dispersed properties can be challenging, with considerations like vacancy periods and potential property management costs if you opt out of self-management.

To manage properties effectively, ensure tenant satisfaction, maintain the property, and handle legal matters, hiring a property manager who is a member of the National Association of Residential Property Managers (NARPM) is an excellent choice.

I also do property management for work, so I can definitely help you out as well if you are needing it fully leased.  

I recommend this book which is amount how to manage your cash.