i live in a 3rd floor apartment so no backyard here either
but he's trained on the pee pads as well i leave the pee pad on the bathroom floor since it's tiles i rather him make his mes in there than on the wood floor he's 1yr and 2months so we have a little hallway in front of the bathroom which is good enough space for him but now that he's been good i now leave our bedroom door open so that he has more space to run around i leave him like 5 toys and enough water and food unfortunaltley i cant go home for lunch nor do i have anyone to walk him but he's good he just get's super excited when i get home and we are also gone for 8hrs so dont worry i did how ever take a few days off when i first got him