I have two hunches. It could be Numenor, or somewhere in Valinor.
This has already been posted, but I’m pretty sure that’s Valinor since the two trees are in the background.
I only see one tree.
It’s that one is very bright but if you look really close you see the other’s trunk
One tree looks to be behind and to the right of the other.
I'm so excited dor it, i can't wait anymore mate
The city is most likely Tirion, based on the visible geography. The Two Trees can be seen more easily by adjusting the contrast on the image.
I hope they don't spend too much time in Valinor or Numenor in the series. I'd much prefer they spend time in Eregion. However, looking at the timeline for the Second Age, maybe Eregion belongs more in the 2nd season.
What do you think?