Ask HN: Friendly ways of adding ads to app?

I am searching for ways of adding ads to a mobile app in a more user friendly way. I wonder if anyone here has seen any good examples of how to integrate ads in a way that does not disturbe the user.

I am thinking more in ways like how a lot of podcasts are doing it, where the host is reading the ad. It feels more like a personal recommendation that way, which I think is better.