I just moved a CP & TZ upstairs yesterday in my townhouse. Being that you are going to an apartment your walkways/stairs should be larger than normal to assist in moving in/out large stuff. Along with you doorways being larger to. You should be fine w/ 3 people as that is what I had. We folded the backbox down w/ a moving blanket on the playfield glass then strapped them together. make sure your backglass is locked or taken off for the move. Then we picked the pins up w/ the stronger guy at the backbox end pointing up the stairs, then me on the lockdown bar end pointing downwards. My other buddy was behind me holding/supporting me so I didn't fall backwards if we lost balance. I had a hard turn to make over a railing then sat it upright to slide into room w/ the door taken off hinges. Hope that helps, and feel free to ask any specifics if needed. Like I said you should ok getting them up a flight of stairs just be careful with the dolly slamming hard down on stairs. Good luck!!!