Hi Jacob thank you for your feedback.
As explained in the house rules, guests need to be pre-approved. Had you booked through the site to accommodate your guest, an additional $15 would have been added to your payment. Also, you had asked if it was possible to have only one guest stay for one night, and I gladly approved. However, two friends stayed the night and I didn't add additional charges.
As for my guests, I had invited a couple friends for dinner while you were not there and after eating we all left the apartment. When we returned, they only stayed for 15 minutes. At this time you and your friends were awake and socializing. Had you expressed your concern about the noise, I would have address the matter immediately. But I cannot fix something, if you do not express what is bothering you.