It is the stem and bonnet assembly that broke. The threads inside the faucet broke, which caused the leak. So we essentially couldn't use the city water hook up. Not too serious for the weekend as we just used water jugs to flush the toilet. But I'm having trouble finding replacement assemblies.
I bought a replacement shower faucet in hopes of changing that out, but tehre is no access panel to the shower.The sink uses the same system, so I may have to purchase replacement faucet for the sink and use the parts from the old to fix this one.