çırağan palace kempinski lobby = free ac, marble bathrooms, and bosphorus views. Walk confidently past the doormen on çırağan caddesi like you're meeting someone for tea

Beautiful ottoman palace interiors, spotless facilities, comfortable seating overlooking the water. Perfect for recharging between dolmabahçe palace and ortaköy without spending 200 try on a cafe that's not even air conditioned

Just act like you belong and don't camp out too obviously. Also works when you need to escape 40-degree august heat and can't face another sweaty museum