I think I posted about this a few years ago only it was my machine that smelled more than my laundry.
First, since you are renting, don't assume that anything has been maintained or connected propery. Most UK washing machines do NOT hook up to the hot water tap. They heat the water internally. So see if you can verify how it should be hooked up with that manual you found.
Second, regardless of how it hooks up, you'll need to do some monthly or even weekly maintenance. We found that a wash (with nothing in the machine) on hot with a splash of bleach and/or vinegar helped a lot.
I think powdered soap has a tendendy to build up more in the works than liquid and perhaps fabric softener as well. We didn't use softener or powder. IMO, you *should* be able to do a night-time wash and hang things out the next morning. We could, but it took all the above to keep things smelling nice!