Norway in August

Define "good".

There are many possible options. It's hard to come up with suggestions without knowing a bit more about your trip.

Yes, more information needed.

How long? Will you have a car or rely on public transportation? How many and ages????

What are you hoping to experience?

And what's your budget ?

"Base location" sounds as if you may want to spend all your nights in one place. I wouldn't plan to do that. Norway's geography is challenging; it doesn't lend itself to a hub-and-spoke trip.