When I go to a location I'm going to use I take a camera but my notebook is much more useful. In it I record any thing about a location that I couldn't get from a guide book, such as smells, sounds and tiny details that you'd only know if you'd actually been there. I write details about specific places at the front, and more general observations in the middle.
These are some general details about Rome, as written in my notebook:
Tiny cars - have some that look like Cousin It in the Adams family
Down every street lines of parked scooters - Lambrettas & Vespas
Constantly changing road surface - tarmac, cobbles, flagstones
Lots and lots of specialist shops. Row after row of different knives, for cooking, for doing anything. Clippers for nails and nasal hair - who would have thought that the world needed so many varieties of nasal hair clippers? Pen knives, chisels for wood carving, Canadian dental cream with retro pictures of Canadian Mountie, at the back an advertising poster with Mountie plus blonde haired girl in red chequered shirt, drawn into impossibly tiny waist and v 50s pointy breasts.
More is definitely not less here.
Pope shop - red, purple, scarlet, orange. Flat shoes for nuns - 69 pairs.
(I can remember counting the shoes.)
This ended up in A Single to Rome as:
Another cobbled narrow street, then another, punctuated by random shops. One was selling nothing but clerical items, everything from wimples and dog collars to shining gold-embroidered capes fit for a pope, and sixty-nine pairs of sensible shoes and sandals in shades of grey, beige and black. Another had nothing but rows and rows of different types of knives. Knives for cooking, for cutting, for hacking down jungle undergrowth, penknives and chisels for wood carving, and an extraordinary selection of nasal-hair clippers. It had never occurred to Natalie before that there could be so much choice for a nasal-hair clipper, but here they were, offering different sizes, different grips, different mechanisms.
Street surfaces constantly changed from tarmac to cobbles to flagstones, and down every street were lines of motorcycles, mostly Lambretta and Vespas but also other bigger machines. Dotted between them were minute cars, some that looked as if they belonged to Cousin Itt in the Addams Family.
(The Mountie and his girl never made it - not specifically Italian enough.)
The most important point is that if anyone wanted to use your novel or short story as a guide book they would have gone out and got a guide book in the first place. Your descriptions need to create the world your characters live in, rather than be a list of facts.