There are two Studio Plus locations in Orlando, one on International Drive and one on Major Blvd., near Universal Orlando. The I-Drive location has rates starting at $289 a week, the Major Blvd location has rates starting at $329 a night.
I am familiar with the Major Blvd location. The rooms are very nice and the kitchen exceptionally well stocked with dishes, utensils, etc. The pool is small. If you want to save a little money, you can stay at the Extended Stay America location, just a short walk away (owned by the same company). If you stay there you can use the Studio Plus pool, but Extended Stay is not really suitable for more than 2 people to a room.
No breakfasts (unless things have changed), but the kitchen makes it possible to make your own at considerable savings. There is a Publix supermarket just a short drive away.
As to distance from WDW, it's a pretty straight run down I-4. Without traffic, I would estimate 30 minutes or less.
To get an idea of what the rooms look like, visit:
http://www.studioplus.com/studioplus.html