If your water is properly cared for, there should be no "bad smell". If your water stinks, there is a problem with it. So smell is the last thing I would worry about.
Not true. My current overstocked 400L tank has pretty much perfect water (Am 0, Nitrite 0, Nitrate <30ppm, TDS <80) yet if I leave the room closed over night it's pretty stinky in the morning. I can only assume this is because of the sump, the tank is on an open steel stand and the filter wool is open to the air, and the smell is more noticeable as it gets closer to water change day. If I were having a tank in my bedroom it would have to be running canisters!