Check-in and out are usually simple, especially because guests are typically excited about their event. I have a rough itinerary before rentals. A few days prior to the rental, when Peerspace sends a reminder for your upcoming event, I message guests requesting that they look over the space rules. The allows guests to ask questions and gives me some security on overtime charges.
Before scheduled check-in, I make sure to put a sign out front so guests can find the space easily. My sign says “private event”. Then when guests arrive, I greet them and give them an instruction sheet for the space. This also lists the overtime policy.
One really important note is that people ofter leave small items behind. I have gotten into the habit of walking through the space with the guests just to make sure they haven’t forgotten anything. It saves them from having to come back or me from mailing whatever is left. Also doing a walk through before guests leaves, gives them an opportunity to mention any damage (or for me to find it and ask about it). It is much easier to address issues in person than over the forum after the event because the evidence is at hand.