I think generally, it is difficult to find apartments with 3 rooms. Maybe you can rent one with two rooms, in which one is bigger than the other than one can share. Oh I think you can try chestnut arms; Colin, Ganesh and Saurabh are sharing an apartment there.
The streets on walnut, chestnut,locust,pine,spruce after 41st are not ghettoish but it's just very quiet at night, so this is what makes it dangerous.
I think Filbert and Powelton area are too far from walnut, chestnut, so dun think of renting the house there hahah The streets beyond market street is generally not advisable to stay in.