Hosting wanted: Marie travelling with Julien to Paris for treatment

My son Julien has been accepted for treatment at Paris Children's Hospital in Paris, starting on Thursday in December. We live 467 km away in a village four hours away, and hotel costs would use up what we have set aside for the treatment itself. We're looking for a room, granny flat or short-term rental within about 30 minutes of the hospital, for 3 weeks. Two of us would stay: Julien and me. We can contribute $135 a week and cook for the household if you'd like. Julien will have some immune precautions, so a clean, smoke-free place would be ideal. A kitchen is a bonus. Thank you. Please ask me anything in the questions section. I'll answer honestly and quickly.