I hate when I lose suspension of disbelief when an author gets something wrong that I know about and so I don't want to do that to my readers.
It's got to be a place you know really well. Getting the facts wrong will ruin the story for anyone who knows the place. (For instance, in my WIP one of my characters eats breakfast in a diner that, I remembered later, closed several years ago. I'll have to fix that in the next draft.)
The beauty of getting it right hit me a while ago when reading a John D. McDonald novel. (I was on a JDM kick and reading every book of his I could get my hands on. It's an obsession I'd recommend to anyone – that man could
write.) In once scene Travis McGee and his sidekick go to Utica. They stay at a Howard Johnson's outside of town, decide they want to eat in the city, open up a phone book and say "looks like Italian," pick a restaurant, go there and comment on the weird paint job of the housing project across the street.
Then they continue their adventure by visiting another town a half hour away from Utica.
That town doesn't really exist, but could.
His story takes place in the sixties. Today that Howard Johnson's is boarded up, but it's there, exactly where he said it was. I've had dinner at the restaurant he mentioned, and the housing project across the street still suffers from the weird paint job. And yes, Utica has a strong Italian influence.
Not only was I impressed by the accuracy of his descriptions, but when he wrote about places I've never been, the memory of his descriptions of Utica made
those descriptions ring true.