Okay ... A Guinea Pig/Hamster is nocturnal; Fish/Turtle close to reptile ... Have you considered a small bird, perhaps cockatiel? They are sweet and loving - and love to learn. Like any pet, give them allota Love; keep them fed & watered, and their area/cage clean, and they're happy. They are usually acceptable for apartment life. I'm glad to hear you thinking about what would be a good pet for you Before you go get one. Too many people consider their pets casually; as throw-away friends. They're not. Good luck in your search.
Guinea pig
Fish Turtles
I think a sweet little bunny would be good.
Fish.
Hampster.
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