My son will be starting a 2-day, 3y/o program at Hobson Cooperative near Naper Blvd. and Hobson Rd. next month. I received several personal recommendations including one from our pediatrician when researching the different schools in the area.
Although the morning class is full, I believe there is still space in the afternoon class which goes from 12:30-3:00 on Thursdays and Fridays. As far as I know there are 12 kids enrolled in the afternoon class and because its a cooperative preschool there is one teacher and 1-2 parents who assist the teacher per class.
My son is not fully potty trained yet, so I was sure to ask about that and no, they do not require the children to be potty trained. Also, tuition is $160/month.
I would be happy to supply you with any additional information including references from parents with one or more children who are or who have attended Hobson. Good luck in your search.