Soundproofing shared bedroom walls? is it worth it?

[Rojay Chase]

I'm closing on my first house hack in 30 days (not counting or anything).

It's a 3 bd 2ba condo and each room shares a wall with each other. 

My plan is to rent the additional 2 rooms out so is soundproofing something I should be worried about?

According to my HOA, I will have to rent the rooms out for 3 months or longer so quick rentals like Airbnb's isn't really an option and I would prefer to have tenants sign a 1yr lease anyway.

Should I just make house rules and call it a day or is this worth the investment? 

Just to clarify,

Bedroom 1: shares one wall with the living room & one wall with bedroom two

Bedroom 2: shares one wall with bedroom one & one wall with bedroom three