I hope you hold fast and are determined to keep your guinea pig baby no matter what. Guinea pigs are better than an IPod touch.
I am very sensitive to smells and ask anybody to tell me if the guinea pig cage smells. I find the bigger the cage the less the smell, plus spot cleaning helps.
My sister had a rabbit. Rabbits can be more trouble than guinea pigs. They need 'out' time. They need to hop around the place. Then you have to rabbit proof the area if you want to keep your electrical cords. My sister's rabbit like to scatter hay around the place. On the plus side they can be potty trained but their cage can get quite messy at times.