I finally bought a stackable washer and dryer last year after spending too much time in laundromats. I really enjoy being able to wash batches of laundry on my own time in my own house. The hardest part was getting the dryer properly ventilated.
However, there is one minor drawback with a stackable washer and dryer. The lid on the washer cannot be opened very wide. There is an angle cut on the bottom of the dryer which allows the lid to open about 30 degrees, but I have found getting heavier items like jeans or towels in and out of the drum is challenging. If I had two separate units side by side, I could open the washer lid all the way and pull everything out at once. The dryer door is totally accessible, so it's a trade off.