A place to stay near Bangkok University Hospital while Nittaya receives treatment

My mother Nittaya has been accepted for treatment at Bangkok University Hospital in Bangkok, starting on Tuesday in November. We live 150 km away in a town in the north, 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 4 weeks. Two of us would stay: Nittaya and me. We can contribute $40 a week and cook for the household if you'd like. Nittaya will have some immune precautions, so a clean, smoke-free place would be ideal. A kitchen is a bonus. Thank you. I never thought I'd be the one asking, and I'm grateful for every bit of support.