Chuckie and Kimi work there part-time, and Betty helps Chas and Kira run the place. Chuckie, Kimi and their friends, including Angelica and Susie, hang out there a lot in the spin-off series to Rugrats and All Grown Up!, when they're in middle school.
The coffeehouse is shown to be a very popular hang-out for other kids from their school.
The babies hang out in its playpen a lot.
You can find the Java Lava Coffee House gallery here.