Hi. Welcome! It sounds like you are thoroughly researching before you buy - very smart!!
I have only had little girls, but both were pee pad trained. Once they were trained, I never had a problem w them going elsewhere. I used a "play pen" like device. They come as different models x-pens, seabreeze petite pens, etc. I put the pup's bed, food/water dish, and pee pad. It would be cheaper than the apartment and give the pup more room to move around. This really worked well. Gidget still stays in her play pen if I am away (now that she is trained and has run of house). The play pen I have can be adjusted larger or smaller. I use it smaller at night. Just her bed and a pee pad in it. She sleeps in our bedroom in her playpen next to the bed.
I liked this method and it worked well, but you will have to decide what will be best for you and your pup.
You'll have to post pics when you get your pup! Have you found a breeder yet?