Homeless in Paris for 12 hours

We took an overnight train from Spain to Paris last night. We arrived in Paris this morning at 7am and don't get the apartment that we have rented for the week until 7pm tonight. There isn't any other city that we would prefer to be homeless in for 12 hours.

What city would you pick to be homeless in for 12 hours?

Magda (not George's mom, but other Magda) - we thought we might do some shopping. We need jeans or warmer pants. Have any recommendations?