In Search of a Rental Housing

Hello there!

I will be moving in Waukesha for work in September, and I am looking for a rental house for me, my girlfriend, and our dog.

I saw on Zillow that there are very few houses for rent. I looked on Facebook for groups where people can share their rental offers but I couldn't find any.

Can you guys help me finding some useful resources? Can you suggest any good agency or warn me against any bad agencies in the area?