I've got a washer dryer (cos I've also got a very small kitchen) and I haven't really had much problems with it. However, one thing to bear in mind for most washer dryers is that your optimum washing load is about twice your optimum drying load so you either

a) let it try to dry a full wash which takes longer and which might conceivably break the dryer eventually
b) wash half loads and let them dry, thus taking much longer
c) wash a full load and take half of it out to let the other half dry which is frankly a faff.

Given that mine is a rented machine, I'm going for a) on the grounds that if it breaks, they'll come fix it.