Ducks are physically unable to hold it (except for when broody), so if you want it to be a houseduck, consider a duck-crate or small section of a room that can easily be cleaned up, and possibly a diaper harness.
Ducks have loads of personality, and can be trained to do many things. I have a bunch that are pets. Because there is a flock of 13, I keep them either in their basement pen or outside during the day in their day pen. I come to them for visits and "conversation." They love their outdoors time, and are content inside as long as they get enough human attention.
Take a look at Melissamerry and her adventure ducks. Nettie also has indoor ducks, and there are more members who keep at least one duck inside. Sometimes it starts out like yours, with a single duck. Sometimes it's due to injury or illness. It may be short term or long term.
Please keep us posted on your thoughts. Do you have an area that might be dedicated to duckspace?
Ducks are social, and so a couple of little duck buddies might be a really good long term approach.
Edited by Amiga - 12/23/12 at 8:05am