When Sophie was tiny I used to put her in her swing chair or bouncer in the bathroom. Then it would be her cot with a few toys. She went into a bed at 18 months after climbing out of her cot, so I used to just have the travel cot up in the living room all the time with a few toys in it for her to go into when I needed to do anything like putting the washing out, showering etc. Our stairs in the house we were in at the time went down into the living room and started right outside the bathroom door so I just left the door open and I could hear her.
Since we've been in the house we are in now, which we moved into just before she turned 3, I've put the TV on for her while I've been in the shower because we have a shower room just across the hall from the living room and i just leave the door open. I also sometimes have my shower at night instead after she has gone to bed and dry my hair downstairs. x