I really feel you on this, it can be so stressful trying to find reviews for smaller centres especially when you are a first time mum and just want to make sure your child is in good hands. I don't have personal experience with Joystar but a friend of mine did send her child there for IFC and she said the teachers were warm and attentive, and her child settled in pretty well after the first few weeks. Maybe you could also request a centre visit so you can get a feel of the environment yourself before committing lah, that always helps more than any online review.