When we first got Meka she used a playpen....Then we moved when she was 3 mo's or so. We transitioned her to be in our washroom area downstairs. Its like a little room and it was blocked of by a baby gate. She had her food/water bowls on one side, with toy box & bed...then the other side has her pee pads... she did fine, though at first she would get up daily at 4 or 5 am and bark for me to come get her. She's 9 mo's now and she sleeps in our room, in her bed that's next to my bed... she has to go downstairs to her area to use the bathroom and eat/drink, but she's been doing well with sleeping through the night now...
So I would suggest blocking off area's that you dont want him in, with a gate. Definately designate a spot for his pads and water bowl (should always be the same spot) and always talk to him firmly about what he cant do in the new space... Hope this helps
