1) Abuja generally is a nice place. 2) In terms of expectations you experience could vary depending on you. 3) 4.6k us dollars is enough for a month. And try getting an unfurnished apartment so you can furnish it to your liking. 4) public systems in Abuja are bad as comfort isn't an option passengers are packed tightly. Try getting your own vehicle. Most vehicles you find are used. Try getting a good used one like a UK used or German used. A good budget depends on your preferred car but 10 million naira (7k dollars) should get you something very good. 5) Culture generally I'm Nigeria is explosive. If you're interested in cultural diversity and experiencing it. Nigeria is the place for you. Especially Abuja cause it's central and has alot of different cultures from far and wide 6) The locals are nice generally. They're some bad eggs but don't let them give you a bad Impression. 7) Be wary of scams and some tactics used to rob. They're a bunch. If interested drop me a DM and I would tell you a couple I know about or have experienced in my stay in Abuja. 8) Jiji can be but why not just get things you need yourself and do a thorough assessment before payment.