Since there are 5 houses, the center house would be house #3. Using clue 8, we can fill in that the person in house #3 drinks milk.
Since the Green house must be left of the White house (according to clue 4), the Green house cannot be house #1 because we already discovered that house #1 is left of the Blue house. Since the owner of the Green house drinks coffee (clue 5), the Green house cannot be house #3 either because that owner drinks milk. House #4 has to be the Green house, which would make house #5 the White house.
Now that we know house #4 is the Green house, we can also add in that the owner drinks coffee.