Hi Mags,
The first office is actually easier to find! I 'drove' the last section on Google street view, so that I knew what landmarks to look out for before we did the journey for real. It's west of the city centre, so the worst traffic we encountered was at the very last roundabout, but only because we went in 'rush hour' for 9am appointments. Whatever time your appointment, just go early and give yourself plenty of time - there's a cafe on the corner of the street, about 500m from the foreigners' office.
You don't need a translator. I had all my papers organised and didn't wait for the staff member to ask me for individual documents, I just handed him the lot and he sorted out what he wanted, giving me back what he didn't need.
Good luck!
Kind regards,
Kim