Arrive a bit early. Act normal and plausible. Go to the bar or coffee shop, order something and read a newspaper or magazine. If challenged say you’re waiting for a mate (you won’t be challenged if you dress ok and act normal). Ideally take a seat where you can survey the reception and see the lifts.
Dont hassle the girl to be let up early, but it’s ok to text and say you’ll be a bit early and will wait in bar.
Also, Tripadvisor is a great place to see photos of the interior (reception, lobby, bar, etc.). Gives you a chance to think ahead.