I would suggest lookup spothero for a cheap and close spot in dowtown . You will have tons of options

No reservations.

Plz call them since the Downtown area is closed I guess the hours may differ

Call them but the place is not so big and in chicago I bet they won't close the place for a party.

No. Only some mugs and memorabillia. Its a cafe' mainly

No it's not a franchise only two locations in the US. Chicago and New york.

No reservations taken

You should call or Direct Message them since the Question and answer page here on Google is answered by the community, not the owners.

They have a limited number, that are without Nutella. Most food items are with Nutella, and they probably have a shared kitchen to prepare all food items, so I'm not totally sure how well whatever you order will be 100% gluten free. I would suspect you probably could get certain things as gluten free, though. Dislike that they don't spell out the gluten free items, with a GF symbol.

They have the same menu all day. That includes breakfast items like bread with Nutella, yogurt, coffee, hot chocolate, croissants with Nutella etc.