Check out uuni pizza ovens. They use wood pellets for fuel and in 10 minutes of pre-heat mine gets to the necessary temp to cook a pizza in a minute or so. Small enough to put on table on a balcony or fire escape and you can even pack it in a carrying bag and take it on the road.
It probably is, was just trying to think of the equivalent for a place like NYC where apartment balconies are less common than they are in CA. OTOH I am pretty sure I have seen a small weber or two on fire escapes on occasion.
No different than any place that allows you to have a grill at a similar location, and since there are never going to be flare-ups or similar issues it is actually safer than those items; for CA residents you need a concrete or stucco balcony, no wood. I use mine in my English garden (back yard) but it is portable enough for lots of different locations.
I like mine a lot and it was a lot easier to move to a new place then the fire-brick oven I had planned for several years ago. It limits pizza size to about 14 inches but since they cook insanely fast it is easy to do personal pizzas for everyone instead of bigger pizzas to be shared. No real smoky taste at all, the wood pellets are a short step up from compressed cardboard and seem to provide nothing besides heat.
Downside is that it only does pizzas. No chance to do pizzas one night and then use residual heat for bread the next day, etc. If you have the means and space I highly recommend a real clay/brick beehive oven, but once you do pizza in a high heat oven you are never going to go back to trying to crank up the temp in a conventional kitchen oven.
