Another FDC customer happy to give you some feedback from this side of the fence.
DD2 goes to FDC 2 days a week. The carer has her 2 children (2yrs & 4yrs), Emily & another little girl in her care on those 2 days. Her house is a small 3 brm, 1 lounge room house. The kids rooms have spare beds in both of them for the kids to rest in. She uses her lounge room, dining area and outside area (undercovered and outside) for the kids. She doesn't travel, but one day a week she has another FDC carer and her kids come over for a big play. Our carer only works 4 days a week and has found it really difficult finding parents who want part time. All the parents here want full time.

Like muminalice has said, if you're renting, you'll need to get permission from your landlord to do this. Usually they're fine with it.

Hope that helps. Good luck.