If you want to keep her away from others' germs, you'll have to stay in your apartment. But there's no reason she has to be "bored" crawling there. Put some cushions, pillows, yoga mats, pool noodles on the floor and let her crawl on, over, and around things. If you have a place to stretch it out, get one of those collapsible play tunnel things (e.g.
https://www.ikea.com/us/en/p/dvaergmas-play-tunnel-blue-green-90547595/)
If you want to get out, playgrounds and libraries are the best. Playgrounds being the less germy of the two.