translation : 要上兩層就見到

要上兩層就見到 = you will see it after you go up 2 levels/ 2 floors/2 storeys

please go up two floors--this is ok, but I think it's more understandable if you say, please go up 2 levels.

要上兩層就見到
You will find what you want at two floors up.

2 flights up and you won't miss it.

Please go to the upper two levels and you'll find it.

you can find it at the upper two levels

Please go up two floors for what?!

"please go up two floors and you'll see"
thanks