Definitely safety gates all around, but be very cautious using them at the top of the stairs as I have heard of loads of bad accidents happening that way, due to the little bit that you need to step over at the bottom of the gate. We have gates blocking off every doorway that leads out to our stairs and at our old house, we had one that blocked off the hallway but still let DS2 go between his room and our room, which meant he used our ensuite when toilet training.