Looks good, but I have two observations: the streets are very uniform in width as though the streets define the buildings and the presence of extreme triangular and trapezoidal buildings bothers me. Consider some maps:

http://maps.google.com/maps?f=q&sour...00971&t=h&z=17
http://maps.google.com/maps?f=q&sour...19419&t=k&z=16
http://maps.google.com/maps?f=q&sour...04855&t=k&z=18

Lots of wandering lanes but nary a triangular building and streets of varying size in each. I understand how these things happen when doing maps like this, but it still disturbs me. Having said that, you're much more patient and effective an artist than mere critics such as me, so take my comments with a grain (ounce, pound, ton) of salt.