The jumping surface is about 1.35m, the trampoline is about 60 cm high (from floor to jumping surface). So if you have small children, may need a stool or a staircase. We have set up the trampoline in the garden. The surface is slightly irregular, but almost flat. Quite just is not the trampoline, but that makes the constancy of nothing, yet it wobbles nothing while jumping. Ground anchors were supplied not there, but also we do not need.
The jumping surface is ideal for up to two children. It is none of these giant trampoline a regular sight in the gardens. This here is just a smaller version of it.
The zipper I find somewhat impractical because it suggests something difficult (you have to hold up, then it goes). Open the other hand is easier. Perhaps this is still in the course of time, when the zipper is used more frequently.