We had this problem with Pebbles scarfing everything in sight immediately, and Sukey doing as you describe Schizo. We have solved it by having the bowls in 2 different locations, and Pebbles knows she's not allowed in the kitchen when Sukey's bowl is. We also shut the kitchen door.

Your flatmates might want to get one of those baby gates for the stairs to keep the dog downstairs, in which case schizo's bowl could be moved upstairs? If there's carpet, some of that plastic carpet protector will do the trick, they will probably need to get floor protector for under the dog's bowl anyway.