Working in a bar/café /restaurant
First of all, don't be that rude person who plugs in and works all day at the same spot and orders just one coffee. If you would like to work outside of your apartment/hotel and you have found a great place, be nice and order a couple of drinks, or even snacks. It's great that all listed places have Wi-Fi, heating (in wintertime) or air conditioning (in summertime) but try not to feel too homely.