Sorry, I would not have a puppy in an apartment unless it was ground floor and had immediate access to grass or a fenced courtyard. Some larger, older homes have "apartments" for rent inside of them or in the basement, etc.
Any puppy will have to be housebroken & may also have tummy upsets, so this makes for a SURE FIRE disaster in a rental unit (on carpet or real wood floors) - if you can't get it OUTSIDE -FAST ENOUGH.
Do NOT fall for the pee or wee pads. That is a SCAM product that DOES NOT WORK (and if you TRAIN a puppy to GO INDOORS - it will NEVER become housebroken (NOT to GO inside) all over everywhere, once not FORCED to GO (by tight confinement) on a pad or fully pad- carpeted, surface. BTW, the absorbing crystals IN the PADS are TOXIC if the puppy chews on, and ingests it.
You need: a crate, 1 water & 1 food bowl (out of stainless steel) 6 ft. leather leash, adjustable nylon/cloth collar with a METAL buckle; NOT plastic buckle (that "breaks" open) with a bit of tugging on the leash. You need the food the breeder or shelter is feeding and a variety (3 to 5 ONLY!) of soft (& squeaky) & harder chew toys that are size appropriate.
I HIGHLY recommend at least one puppy advice/training book such as, "How to Raise a Puppy You Can Live With" by Rutherford & Neil that will take you thru the WHOLE FIST YEAR and various mental & physical development phases.