I have several, in no particular order.
The Dresden House in Windenburg. The house is beautiful & roomy, the big yard is perfect for the outdoor loving sims, and that secluded fishing spot behind it is a great place for your sims to escape to.
930 Medina Studios in San Myshuno. I don't care for the color scheme, but that's easily fixed. It's a surprisingly affordable & spacious apartment, perfect for a growing family.
The house that came with Parenthood. I'm big on family play, so it suits my style perfectly, plus the build/buy objects that came with that pack are among my favorites. I usually either put it in Newcrest or Magnolia promenade. Not much yard space, so it helps to have it next to a playground.
Lakeside retreat in Granite Falls. I always move a copy of this to Newcrest, makes a nice rustic family home in the suburbs.
For community lots, Desert Bloom in Oasis Springs, the karaoke bar in the Spice district & the beaches in Sulani are my favorite places for sims to go.