Moving to Istanbul

Hi, I am new here. I am planning to move to Istanbul and I found this page while looking for apartments. I have also few questions, and I would appreciate if someone could explain few things

1. Since I am working online, is there any chance for me to get visa for longer stay, currently I can visit for three months only
2. What is normal price for small apartment (1+1), with location on europe side near taksim square, or uskudar, kadikoy, (actually any place in radius of half an hour of transport, 45 minutes)  , for short term (one month). What can I expect ?

No
2500 tl

Do remember:

#1. If you're coming here only using your passport/visa of another country, you cannot stay for more than 90 days in the last 180 day period.