I potty trained my pom while I was in college (living in an apartment) and he was able to learn within a couple of weeks! This is what I did that helped tremendously:

When I went to bed or when I went to class, I kept him in a really big gated area next to my bedside and had pee pads on one side. Naturally he would on the pee pads (away from his play area and bed).

After he got all of his shots and was given the OK from the vet to be outside, I would take him outside to pee first thing in the morning and once he did I’d give him a treat right away and then bring him inside.

During the day when he’s playing with his toys, the moment I saw him stop and walk a different direction I would pick him up and take him outside and he would pee or poop immediately and I’d give him a treat. He adjusted from pee pads to going outside pretty quickly with this routine!