What a wonderful dilemma you have - an extra house/apartment available for travelers.
You have the correct business sense to realize that you will get more income by renting bedrooms separately, but the worry about your inexperience. It is obvious you have done some good thinking.
Are you close to the unit? Could you stop by everyday? Could you hire a neighboring co-host? housekeeper?
If so do try to rent out these rooms.
There are many travelers who seek out budget hostels, but don't want to stay in large hostels.
This is what you are offering and it is legitimate.
Although it is understandable to worry about guest interaction, just realize the guests making the reservation are adults. They can worriy about their interaction with others. If they don't want to risk it, they can choose elsewhere.
Most guests are very respectful - not sit around partiers. You can vet your guest by previous reviews, the appropriateness of their greeting (are they coming for a job?, going to museums? Leaving the house everyday?) and insist on valid government ID.
Another way to reduce bad guest interaction is to make your kitchen undesirable for cooking. Remove the oven and stove. Replace large reefer with small indivual refridgerators or just remove it totally. At your hostel price, do you want to worry about a clean stove top or rotting food in fridge?
This is Airbnb many choices available. Use it to your advantage.