Keeping the kitten in a space where you know he/she couldn't get hurt or get into anything is always good, especially when youre gone. As long as the kitten knows she's loved by being given food, water and a comfy place to sleep i am sure the kitten will be alright. A little baby gate always works I got one for my 7 year old miniature dachshund at walmart jus the other day. Every time i walk by i pet him and we keep food and water always with him but most of the day when we're home we let him roam the house. He is still just as happy!