Sometimes I bring my heroes back to a village/town/city.

It would be nice if there was a little bonus for having a hero IN a city. Perhaps AP could regenerate 2X or receive a special 'prise' if the hero stays there for 2 or more days?

I know that you have designed this game VERY well but a few tweeks could make it a little more interesting (ONLY my opinion!).

Citites already provide a huge bonus to the denfence, since you can not attack a hero without troops inside the castle. So adding to that a faster AP regeneration would be more debalancing.