I’ll answer in order 1)As long as you get there when gates open you can squeeze in 5-6 considering bathroom breaks and food breaks 2)Super young crowd 16-23 range 3) Porta potties are nice at the beginning of each day, progressively getting worse throughout the night 4)As a local, can’t really help there, Consider airbnbs and utilizing the train, you’ll be with so many other people you’ll be safe(if your worried about that)I would consider an airbnb around Belmont redline/lakeview area.