Dirty interior. Dust. Food between the kitchen units. Dirty dishes. Very high humidity. And it is impossible to put the 2 small convectors on at the same time, it trips. The owners know this because they had connected a dehumidifier which is useless because it is so humid. Blistered wall. When you turn on more than 2 electrical appliances, it trips, whatever the appliances. Note that you must not be too tall because the floor is under the roof.