You said it Erik! They are great and an awesome pick for new hobbyists.It depends on the size of the tarantula. A full grown adult might need more space, but it would be way too big for a sling or a juvie. Figure 2x the tarantulas length for the width of the tank, 3x its length for the length of the tank, and no more than 2x its length for the distance between the substrate and the top of the tank.
Chacos (g. aureostriata) are very docile t's in general and are a good beginner species. Mine has never kicked hairs.
No they're not, though of course the odd individual might be. Slings will usually at least dig a shallow pit and sit in it, and they will always enjoy digging and moving dirt around for whatever mysterious reasons they have. A happy chaco is a little bulldozer.I've read that they're burrowers.