It was an unforgettable trip for many reasons, one of which is Derin's appartment. If it's your first time in Istanbul (or if you love Beyoglu and Galata), it's a perfect location to discover the city. The appartment is very authentic yet it has all the equipment you may ever need. The air conditionner will save you from both the summer heat and the very surprising winter cold. Derin and her friend are awesome: they are very nice and always available to help.