When going abroad for a while: how to avoid issues with no TW address?

[TaipeiGuy2000]

To register your APRC address somewhere you need a rental contract? Otherwise, I would take the friend’s offer.

Somebody here suggests to use a post office mail box for $300/year:

Address for ARC

I’m planning to leave taiwan for one month. When I come back I will stay at a friend’s place for a couple of months meanwhile I look for a place. I will not have an address basically. How can I do for communications for example from my bank? Or from the government? Is this a problem for the stay of 183days in taiwan to get APRC? How can I deal with this?