I am a professional apartment dweller/yorkie owner, haha. Been living in apartment condos with dogs for years.
If you are not able to come home during the day or have somebody to come home and let him out while he's a puppy, you CANNOT crate him during the day. He can hold it in for no more that 3-4 hours at this age, and by confining him in the crate for longer than that you basically force him to go against his instincts and get used to peeing/pooing where he sleeps. That will make housetraining much much harder later.
I would go with a puppy pen. It'll keep him (and your cabinets and baseboards)safe, and you can put a bed, water/food, and his litterbox in it. You don't want it to be too big though. It shouldn't have much more room after you put the bed and the litterbox in it, so he would have no choice but to go IN the litterbox.
Daycare is also a good option, ONLY if you are 100% sure of the quality of the supervision/training that he will be getting over there. Whatever he experiences, good or bad, during those critical months of puppyhood will have lifetime effects on him, sometimes irreversible. You have to be VERY careful with who you trust your puppy with.
Good luck, and keep us posted on his progres. And don't forget cute puppy pictures
