Being at the moment too incompetent to tackle CAW, I'm wondering if it is possible to change the street addresses and the city name for either Sunset Valley or Riverview? I actually like the layout of both, but would like to completely overhaul the cities, without having to become a savvy virtual architect. Thanks for your help.

CAW can't currently open hoods that have been played and/or have sims in them, including Sunset Valley and Riverview. It ships with empty (undecorated) versions of those towns, but reconstructing all the decorations/lots/sims would also be a very time-consuming matter

Streets don't actually have names in the game, btw... lot addresses are a property of the lot, not the street.

Just rename the lots in edit town. Open edit town and choose each lot and click edit, change the address there for 1 sims lane to 2 metropolis place or whatever. It's very easy and doesn't need CAW at all

Hello,

Sorry but at my Sims 3 it doesn't work and in Lunar Lakes I'd like to add some lots but the street names are the problem!They are not there and I can't change...

TheCMW23- street names can only be added in CAW, you need to open Lunar Lakes in CAW to do this.
http://modthesims.info/showthread.php?t=469942

Otherwise, just add an address in the lot description as fluttereyes says.