"What problems can I expect to encounter."
Noise....lots of noise. 
(at least on 160-40M)
Maybe not.
I live in the city, 60'X110' lot, surrounded by homes, hydro lines etc.
I have a grand total of 517' of wire in the air covering 160, 80,40 X 2.
Noise level right now at 12 PM on 160 is S 4. Not bad considering my location. 75 is noisy today, S7, normally it is around S 4. 40 meters is S 2 which is about normal.
20-15-10 meters on a 2 element yagi S 1 on all bands.
17 and 12 meters, S Meter is not moving and I use two separate raised verticals for those bands. And no, they are not dummy loads as I have worked 100 countries on each band with those verticals. I am sitting here copying a signal that is S 2 with no issues.
At the front of my lot, 27,500 volt lines. Never any issue with noise from them.
So not all urban settings are plaqued with man made noise.
Either that or I am damn lucky! I will admit that once in awhile I get some man made crap on 80 meters. It comes and sticks around for a week or two then it's gone. So someone is plugging in some crappy electronic device in the area.