Guild Wars 2

Is there a way to revisit the shining blade house after completing the instance?
If so, how do you get there?

You can absolutely get back to the house. From the room where you end the instance there is a doorway you can go through. Look for a wooden bridge crossing over to the house (it is a little difficult to see since the instance it so bloody dark).

Edit: This is while you are still inside the trial instance. Not so sure about if you exited the instance.