hye all

i need advice
i plan to move to studio apartments maybe end of dis year
what i want to know
how i want to make sure dat's my babies will stay sane n not nut bcoz the studio does'nt have balcony for them to get fresh air, watch birds .. they maybe become boring
rumah lama i is a landed house.. ader parking lot n garden ...
so i want them to feel comfortable for their new home n takkan poo pee everywhere..

so how?