Do the men want to find something in one of the apartments they knock on which helps to deliver the couch?
Are the men able to reach the stairs where they need to deliver the couch?
Do at least one of them live in that block of flats?
Do they need to deliver the couch to one of their apartments?
Do the men want to find something in one of the apartments they knock on which helps to deliver the couch? SORT OF
Are the men able to reach the stairs where they need to deliver the couch? CLARIFY (YOU MIGHT BE CLOSE!)
Do at least one of them live in that block of flats? IRRELEVANT
Do they need to deliver the couch to one of their apartments? IRRELEVANT
Are the men able to deliver the couch without knocking on the other doors?
Is the couch to big to get it to the floor of the apartment where they need to deliver the couch?
Is the couch to heavy to get it to the floor of the apartment where they need to deliver the couch?
Is there a stair which leads to the floor of the apartment where they need to deliver the couch?