Great! It depends how high the cage and substrate are as to whether they can climb into it. It needs access to a couple of sides if possible and if there's no access on the third side needs clear space under in case he jumps out and needs a soft landing. A shelf or a tube or a grass hammock eg.
Charlie has his vine branch to climb onto at one side, and his boredom breaker chew tube to run through and that leads on to the top of his house. The cardboard tube is just tied to the top of the cage with sisal string.
His cage is quite low at 36cm inside so he can actually climb into it at the front! The front of his is near the bars so he can climb out that way too.