I went to Pitzer for two years and loved Claremont. I really liked the Village which is a small shopping district. I assume housing is really expensive in Claremont because it is a really nice area. The schools are located right at the border of Claremont and Upland. I wouldn't say the area is horrible, but it really isn't that bad. There is a mall and big box stores a few miles east in Upland. There are also two "luxury" apartment gated communities right at the border. It is a 15 minute walk to Pitzer and CGU is on the other side of the campus, so you might want to get a car. I don't know the specifics on cost, but I am sure they are reasonable for a grad student/family. They have 1-3 rooms, kitchen, all appliances included, a small gym, pool, and barbecue place. I know the 2 bedroom have two bathrooms. Also the small bedroom can hold two twin beds. One of the bathrooms is connected to the master bedroom and there is a walk-in closet.
The one I stayed at was College Park because there is a housing shortage on campus. All students, however, have to abide by College Park rules.
I also took a class at CGU as an undergraduate and know some of the religion faculty from CMC and can tell you they are wonderful professors to have.