There usually isn’t one magic setting. This look comes from a combination of conditions and processing:

• The scene may not be very dark at all—urban night shots often have lots of artificial light.
• A relatively fast lens helps. The sample suggests a fairly wide aperture, which also gives some background blur.
• Noise is often reduced in post, or by in-camera noise reduction. That cleaner look often comes at the cost of fine detail.
• A small displayed image hides noise. Downsizing and JPEG compression can make noise much less noticeable than it would be at full resolution.

So to get a similar result, use the widest practical aperture, expose well using available light, and apply moderate noise reduction afterward. Keep in mind that if you inspect the full-size file, some noise will likely still be present, especially in darker areas.

Also, lens and camera quality matter: a better lens and a stronger low-light camera can produce cleaner files before editing, but even then, many polished night images still use denoising.