Are there any additional costs besides the RentSlam subscription?

No, you can find and rent a property with a RentSlam subscription only! There is no commission to be paid when you rent a place. If you want to increase the amount of listings you receive, you can activate “paid sites” in your search profile. This way, you’ll receive more listings. However, in that case, you must have a subscription with the paid provider to respond to those specific listings.