For you adventurous people, there is a lot to do and discover in Istanbul, ranging from the standard sights, such as the Hagia Sophia, the Blue Mosque or the Grand Bazaar. I really enjoyed this part, it was really one of the relaxed places to visit, without permanent 'buy from me', 'hey, my friend' or whatever else people at other popular tourist spots over the world yell at you to get your attention.
However, the most impressive and enjoyable part during our trip to Turkey was literally just strolling around the city, discovering the small side streets, Turkish coffee shops, shopping in general and of course awesome food. The atmosphere of the city is just really relaxed, open-minded, vibrant and full of life. You will never encounter a spare second, when there's nothing to see, nothing to hear or smell, that doesn't get your attention.
If your looking out for a short trip in close proximity to Europe, I'd definitely recommend going to Istanbul. The night life is also very enjoyable. ^^ Also here are the first few shots from the streets of Konstantinopel.
Maurice
P.S.: Just click the image to the right to get to the Istanbul Gallery