Need to notify if mailing address hasn't changed?

[meadow 2]

I (the USC) live with my fiance in Mexico City. Since sending in the I-129f we've moved apartments, so our physical address has changed, but I used a different mailing address in the city (that of an NGO where I used to volunteer that has more reliable mail delivery) that has not changed. Because the mailing address hasn't changed, and we're actually going to have to move apartments again soon, I never notified about a change of physical address.

We just got the NOA2, and as we're getting everything ready for the next round, I was wondering what to do about the physical address? I don't want to cause problems by having discrepancies between the physical address in the I-129f and the DS-260, but I'm not sure if there's a point notifying of a change of address now that we're moving again before the interview (and we're not sure where we'll live next). How important is the physical address when it's different from the mailing address? When the time comes to fill out the DS-260, should we just use the address where we lived when we began the application process?

Any suggestions would be hugely appreciated!