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You can't get even a room with 400 Tl a week!
400 Tl for one night or for the week ?
you have to check housing part , also you can put an AD over there , hope you find it , maybe a room from a flat would be fine
you can only accomodate in a hostel or you can find apart hotels...
You may find some hostel and small hotels around Sultanahmet-Blue Mosque area, for kitchen not sure.
your best bet for 400 would be to share a room or apt. with someone , or else , it will be a bad location for 400 single occupancy . .. .
i hope you're doing ok. . . if ever need any help with something, please do feel free to contact
all the best luck
cheers
welcome )