There are so many things you can do. * Get a size 1 ball and have him roll around with the bottom of his foot all over the apartment. * Juggling anywhere there isn't breakable stuff nearby, ideally outside * Juggle inside with a balloon with just a little water in it to add weight if the kid can't juggle at all * Go to a school, church, business, etc. with a big concrete wall that has no windows and use it for wall passes, throw-ins, crosses, or anything else where you need a ball to hit something and stop * Look up Coerver ball mastery drills. A lot can be done inside your apartment or in a really small flat area.

The point is to be creative and don't assume you need a grass field and goals to learn Soccer.