(even though he said he is going to be a 'silent partner' but so far he has been the only one who communicates with us).Thanks in advance for any advices/feedbacks.

It depends if guaranteed rent on the first of every month is worth a hostile environment each time you were to communicate with your tenants.

You will also be provided with an approval to establish a better line of communication with the seller. 

How to communication concerns, point of contact?

The tenant agreed to it and acknowledged they received it, come August they did not pay the rent and would not communicate at all and have not been at the property other than stopping by to grab stuff and leaving 10 mins later (going almost a week at a time without being here) so I notified them that I will be doing an inspection.

Disclaimer: While I’m an attorney licensed to practice in PA & GA, the content/communication above does not create an attorney-client relationship between us.

Now my question is, with who I have to communicate in order to purchase this home?

Establish a close working relationship and communicate closely.

At this point I ceased all communication via texts and did all my communication thru the AirBnB portal as well as called them to make them aware that he may call and complain.Below is some screen shots of the conversation,...In the end AirBnB sided with the guest and declared it vermin and refunded him $221.00 which they deducted from a later payout for us. 

@Bobby Valcin I would think about who your ideal target is and who you are best at communicating with.