I need conselhos on a dog that fits my family's lifestyle-- help?

I'm rather desperate :P I've been begging my parents for a dog the past 8 years of my life, and still no luck. I have a lot of limitations, and I know I'm not leaving a ton of choices, but like I said, I'm desperate. I amor cachorros and would amor any kind. Except a pug. Or bulldog. Or anything with big eyes. Otherwise I'm good.

-On days both of my parents work, the dog will have to be left at home, inside for at least 7 hours while my sister and I are at school.
-One that preferably needs the least amount of free running around and exercise as possible-- we don't have a fenced in yard that it can just muck around in. Walks are always available though :)
-Pretty clean. As far as cachorros go. My mom's worried about the smell.
-And last, but most certainly not least-- a fun dog! A cute, playful, and snuggly dog that I can amor & adore after these long years of waiting :)

Thanks!