A little silly question but I am struggling (and in fact there is also good) to find Triss.

I found it in Novigrad and done with her quest in the warehouse, then she told me where to find her but I do not remember.

So, where the find?

See my answer to you in your other, identical question thread.

Thanks, I found it.

However now that I think, should implement the use of a "permanent signal" on the map edited by the player, as you could do in Planescape Torment. Otherwise one goes crazy to find the places that may be of interest.