Einstein's Riddle

I picked up this riddle off a Facebook post.  As a self-described math geek (who used to go through logic puzzle books for fun), I was intrigued:

Einstein (reportedly) wrote this riddle early during the 19^th century.  He said 98% of the world could not solve it.  It’s not hard, you just need to pay attention and be patient.

There are 5 houses in 5 different colors.  In each house lives a person with a different nationality.  The 5 owners drink a certain type of beverage, smoke a certain brand of cigar, and keep a certain pet.  No owners have the same pet, smoke the same brand of cigar, or drink the same beverage.

The question is: Who owns the fish?

*The Brit lives in the red house.

*The Swede keeps dogs as pets

*The Dane drinks tea

*The green house is on the left of the white house

*The green homeowner drinks coffee

*The person who smokes Pall Mall rears birds

*The owner of the yellow house smokes Dunhill

* The man living in the center house drinks milk

*The Norwegian lives in the first house

*The man who smokes Blend lives next to the one who keeps cats

*The man who keeps the horse lives next to the man who smokes Dunhill

*The owner who smokes Bluemaster drinks beer

*The German smokes prince

*The Norwegian lives next to the blue house

*The man who smokes Blend has a neighbor who drinks water

As the instructions for this riddle are incomplete, I have to make a few assumptions.  The fact I have to make these assumptions make this riddle flawed; but since certain questions are not answered, one must start with some assumptions.  Because of these assumptions, there may be more than one accurate answer to this riddle.

My assumptions:

I assume the five houses are on one street; on one side of the street; that number 1 is on the left, that number 5 is on the right, and that they are sequentially numbered; that my position is from the street, and that all directions within the riddle are from my vantage point.

1) Yellow; Norwegian; Water; Dunhill; Cats

2) Blue; Dane; Tea; Blend; Horse

3) Red; Brit; Milk; Pall Mall; Bird

4) Green; German; Coffee; Prince; Fish

5) White; Swede; Beer; Bluemaster; Dog

Thus, the answer to the riddle: The German (who lives in the green house, drinks coffee, and smokes Prince) owns the fish.