The compact washer dryer is not something you'll find in every appliance store, which is too bad. The more people know about it, the more they find it has a great niche in the marketplace.
It is an awesome option for those who can't or don't want to go the usual route of large, permanently installed washers and dryers. If you need something smaller, more portable, there really is a direction for you to go.
Problem #1: You don't have the built-in space for two big laundry appliances.
What we're used to, at least in the U.S., is a matched set, washer and dryer, that sit side by side in a large space set aside for just this purpose. All well and good if that's what you have. But a lot of us don't live in a place that has this kind of space. The compact washer dryer is designed to solve just this problem. It's only one unit, not two, and is smaller than even one of the two regular appliances.
Problem #2: You don't know where you would put a laundry appliance.
Okay, so you have a compact living area and you need a compact washer dryer to match. Well this unit tends to run around 34" high x 24" wide x 24" deep. This is small enough to put several places. You probably have a corner of a room where you could stash this when not in use.
Problem #3: How would you use it if the only place to put it is in the closet?
The beauty of these things is that it doesn't really matter where you put it when you aren't using it. Most of them come with wheels on them already, and you just roll it into place when needed. You easily attach the water hose to any faucet and put the drain hose at any drain and you're good to go!