I manage a property in Atlanta that has the ventless combo units. There are multiple issus with the ventless units. We have some located under countertops and some in closet locations. Either way, there are a lot of problems with broken handles (which cost $35 each), high/low limit switches burning out, circuit boards, pressure switch, fan motors, etc.
We out of 118 machines on site, we have anywhere from 5 to 12 service requests each week. They are the number one complaint on the property. The units have an 11 pound capacity, which is about 2 pairs of wet jeans. If the resident overloads the machine, it busts the drum and causes a water leak. They are very small capacity, however I would agree, they are better than not having any washer/dryer units in the apartments. Just be sure to budget for the repairs.
We currently have Ariston and Haier units. I would not recommend either of these units. Parts are impossible to find for the Haier and one company purchased all the Ariston parts and they hold you up on the cost. The handles were $7 each and when the new company purchase the supply, the handles were increased to $35 each.
We have been looking at the LG's. The snall units are a 15 lb capacity with good reviews and there is even a full size ventless unit that is 22 lb capacity. The small unit would fit under a countertop but the full size would not because it is 36" high.
I have been working with the ventless combo units for 5 years. If you would like any additional information, please feel free to call me 404-961-7130.