I remember seeing that Voyager 1 is currently in interstellar space and will continue to move indefinitely. I however could not find the reference of where (in the vicinity) Voyager 1 is now. Is it close to some star or is it just traversing empty space and not close to anything?
Voyager 1 and 2 are still in the "neighborhood" of our solar system and very close to our Sun compared to any other star. They are roughly three times farther from the Sun than Neptune and Pluto and so already past the Kuiper belt where New Horizons is currently traveling.
As the diagram below shows, the Voyagers have passed the boundary where the Sun's pushes back on the interstellar plasma, but still much closer than the proposed Oort cloud of objects that are thought to orbit the Sun as left-overs from the solar system formation.
The difference is velocity; slow objects can still orbit the Sun at 100 or 1000 or 10,000 or 100,000 AU as long as they are slow enough to be trapped by its gravity. The Voyagers have more than escape velocity and so will continue to move away indefinitely. See this answer for more about that.
above: data for the Sun, planets, Pluto, Voyager 1 and Voyager 2, from January 1, 1969 (a good year to start things) until now (2018). Dots are now. Data is from NASA JPL Horizons.
Voyager 1: Departed the ecliptic plane right after Saturn going "north", and is shown in magenta going "up, above" the ecliptic.
Voyager 2 After Saturn remained within the ecliptic plane in order to pass by Uranus and Neptune, at which point it "went south1", and is shown in mustard yellow going "down, below" the ecliptic.
For more about why they are going out of the ecliptic after their last swing-by of a planet see answers to
- Why is Voyager 1 faster than all other space probes?
- Why did Voyager 2 receive a gravitational slowdown (as opposed to a slingshot) at Neptune?
- What if the Voyagers had remained within the plane of the ecliptic?
Since this is 2021 now you can add a few more millimeters to the ends of the trajectories.
Where to next?
- Where are Pioneer 10, 11 and the Voyagers ultimately headed?
- Could space probe Voyager 1 or 2 reach Alpha Centauri?
- What is the first non-solar-system object Voyager 1 will run into?
- Could one of the interstellar probes discover Planet IX by accident?
Caution: This is a log scale so each number is a ten times bigger than the last one.
Voyager 1 at 100 AU is in "interstellar space" as far as the Sun's effect, but there are still believed to be primordial stuff orbiting the Sun as far as 10,000 AU and the next stars aren't until about 300,000 AU.