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Dedicated to my friend Ra.
At the given coordinates look for the building named as shown in the picture "Start".
Please be very careful, Ra might watch your back from above.
At the corner is an establishment located. Who was the first founder of this type of pub in Vienna? He died 1725. Not far away, maybe 10 minutes to walk, you can find a very small park dedicated to this person. There you can find the cache; the location is save from dogs and dirt!
(No hints available.)