Istanbul recomandetions for chill tourist

26F here

I want to go to Istanbul for my 27 birtday. But I am tired from my work and I will arive by bus at 4:00 AM. I want to take it chill. I want take a coffee and island hopp, go to the local bazar, go visit the asian parts and take a stroll there. I want to visit basilica cistern, dolmahbace palace and maiden's island as historic touristic attractions.

Please recommend me a youth hostel so I can meet new people. I usualy book a bad in femmale room. Also I would be gretful if you recommend me non-touresti activities, where to meet locals, tips and tricks for travelling around Istanbul, even classes. I saw there is a girl that holds classes for dying your lamp.

Many thanks in advance