I would like to see Dick Grayson in a location - a city - because that's where his civilian activities are. The idea of him being the owner of a bar and nightclub is actually pretty great.
The city can have low- to medium- level crime (medium-level includes some medium-level supervillains), which he fights as Nigthwing (there is nothing wrong with some street-level crime-fighting), and a number of interesting characters - some superheroes and supervillains, and non-super supporting cast - that he can interact with, along with visitors from his long superhero past.
There can be
occasional large-scale threats to the city, but it shouldn't be constantly on the edge of collapse, alien invasion, or destruction. I see it as a more stable place than that. This would free Dick up to have story arcs that take him anywhere in the world, taking on major supervillains with wide-ranging, dangerous plans, and assisting (or fighting against) his old acquaintances in the world-wide spy business.
So: his city as a place for street-level adventures and a solid supporting cast, but stable enough that he can leave for far-flung globe-trotting adventures. The character is well-suited to both, and I would enjoy seeing the contrast.
I would not use Blüdhaven. Starting with its name, and then its early introduction, it was set up to be "Gotham but more explicitly violent and seedy." Which keeps him too close to "a version of Batman in his version of Gotham City." The current Atlantic City vibe is a little better, but the name Blüdhaven is too deliberately ugly to match what I have in mind.
But that's just me.