I recommend City Living! I used his world a lot, can't really recall what features it brought along, except the Karaoke bars and festivals - all great. The world is big, and hoods feel a bit diverse. Hoods are busy enough to give a satisfying city vibe. The flats are fine, but I do miss more community lots, especially if you own packs like Dining Out and Get To Work, you will find that the city misses restaurants and shops. You can have community lots in flats, but it looks better on the street... With a few adjustments in the community lot department, depending on your packs and your needs, the world is good. I wish we could get another city soon!
Adding: BB&CAS adds tons of international content, reflecting multiple cultures around the world. Might be useful also in other worlds, ie in Mt. Komorebi which came later.