last summer i traveld italy for 3 weeks from top to bottom and back, however, of your list i only visited rome. i only took my 21mm ltd with me and the M50/1.7, and surprisingly it was really fine. i took people shots, portrait (half & full body), landscapes, general street photography, architecture and night photography. unfortunately i didnt have a tripod with me so i had sometimes to use high iso, when i didnt find a place to rest my camera on.
the 21mm was pretty much glued to the camera, if i needed somethign wider i just took a panorama. but most of the time (>90%) the focal length was pretty much perfect for everything.
so, i would suggest you, travel light but bring a tripod. especially in pisa (i have been there before) you might want to take pictures of the tower at night if you dont want all the tourists in your shoot playing thriller. or take a ND filter that gives you a few seconds of exposure to eliminate all the people.
out of your lens portfolio i would lean towards mostly wide angle.
10 - 17
20 - 40
and perhaps the 31mm, or something that gives you great starbursts. makes night pictures really pop
and if it fits, something a little longer. since sometimes my 50mm was necessary to get that shot.
note however, i dont own any of these lenses, so all i can take for my consideration are pictures i've seen here.
hope that helps, have a good trip and dont forget to bring your charger and sd- cards