This is my opinion, but we are all really different, so you might just give it a try.
Istanbul is great! My favorite place to stay is Kadiköy on the Asian side. There is a lot of nice people outside at night, small pedestrian streets with nice bars, not as crowded as the european side (but crowded still, don’t misunderstand me).
My experience is that it is hard to get an airbnb late (like, for tonight or tomorrow). Best to plan ahead. Otherwise, tons of cheap hostels in beyoglu and sultanahmet. But they are very un-even, so you can give it a try. I love the hush moda hostel in kadiköy, and Neverland in beyoglu. But if you want to work, the internet can be unreliable, and you’ll have to use the dinning tables as desk. For the price, I find Istanbul expensive in general. stay with hostels or airbnb (the prices are not overrated), the local renting system is not worth playing with if you stay so short.
If you are into coworking, Yazane is the best. I have tried Urban Station in Maslak only. It was very “quiet” (4-5 people, not much interaction), but the one in galata or sisane could be more “alive”.
Hope you will enjoy it!