There is not much safety issues in this part of the city really, at least not as much as you'd expect from a city of this size.
There are some issues to keep in mind, though:
Some parts of pedestrian promenade at the Bosphorus side of the street in the upper northern sections of the district, especially between Yeniköy and Tarabya, and Tarabya and Kireçburnu, are very narrow so narrow as not to let two pedestrians comfortably walk side by side, so watch your steps if you decide to take a stroll around there.
While you will see some people mostly poor children, who cannot afford to swim in swimming pools swimming in the strait, it is discouraged and is dangerous due to strong currents and depth. There are red colored warning signs in Turkish dotting the shores of the Bosphorus, warning swimmers that swimming is dangerous due to strong currents, even though there is no ban. Nor are there any real beaches, facilities and designated swimming areas on the Bosphorus for swimmers as a result. There is indeed a cape named Akıntıburnu literally, "cape of current" just east of the neighborhood of Arnavutköy, in which the current is at its strongest, and is easily visible even from outside, just like the flow of a river. Besides, the water is not that clean either, however blue it may look. So, if you can't wait for hitting a Mediterranean beach, better head for beaches on the Marmara coast, outside Istanbul instead.
You may want to steer clear of the dimly illuminated parks on the upper/northern sections of Bosphorus, especially around Kireçburnu, late at night to avoid harassment from homeless people likely abusing inhalants, who are known to stab people for whatever amount of money they can get, no matter how little. Dayhours and evenings are perfectly safe, though.
contact
A number of standard internet cafés i.e. which offer broadband connection, printer, and CD burner, and most likely a meager selection of canned soft drinks can be found on the side alleysâespecially on those to your left when BeÅiktaÅ is behind youâof Barbaros Bulvarı, the large avenue going uphill from main square of BeÅiktaÅ.