When I'd travelled in Italy years ago, I booked our hotel rooms before we left (thanks RS guidebook). I booked "double" rooms throughout, but when we arrived all of the rooms had two single beds pushed together. Due to the uncomfortable crease down the middle, we slept on only one side each night.
To save money on an upcoming trip to Slovenia, is there anything wrong with booking a single room for two people? I don't want to sneak a second person in - I'm just wondering if it's ok to do this or if it's frowned upon. If we show up with two people for a single bed room, will we be turned away?