Any Imgurians in Chicago?

I'm running my first half marathon in the Chicago half marathon series this May and running a second in September any imgurians running either of the half marathons or have tips on lesser known things to do/see in Chicago?

I also booked through air bnb for the first time and would love to hear from people who have experience with air bnb the host seems really cool and has great reviews I'm just curious on what the etiquette is like when staying somewhere that the host is there.