Planning a trip for late June into early July 2019. Need a place to stay and a rental car along with must see places within four hour drive of house/hotel.

Also where do I fly into to get to Bella Vista?

Looks a bit out of 0-0's area of operations. Sounds like you may need a travel agent.
San Juan has the nearest airport.

Will look into it.
Email me, please

0-0

I'll ask here in Buenos Aires, but they'll ask me how many days, travelers, type of accommodation, etc.

You'll likely fly here and from here to San Juan.

AFAIK. it's main attractions are the landscapes and being part of the wine production region.

You have plenty of time, we can work it together easily and slowly.
Will be a pleasure to meet another board member f2f. Been a while.

0-0

Got my email?

0-0

I did sorry. I started a reply on my phone, then decided to finish it on the computer and didn't send it.