0 End unit means it is at the end of a hallway (or the end of the building if the entrance is outside); you would only have a neighbor on one side, not both. 1 level means that the apartment itself is all on one level -- there would not be an upstairs and downstairs within the unit. 2nd floor means it is on the second floor (which I think is called the first floor in Europe; that is, one flight of stairs above the ground floor).
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00Hi, meantolearn. In a split-level, you have two or three levels, but they are only about half a flight of stairs apart. For example, you walk into a house on the ground level, and there you have the living room and kitchen. Off to one side there are two short staircases, one going up to the bedrooms, and one going down to a den or family room. The bedrooms are directly abov