The Microtel hotel chains may be what you are looking for in simple, clean rooms.
We've used them for nights where we are just pausing in the middle of a trip to sleep. They are simply equipped...no special amenities...usually not even a pool...but they are very clean, the customer service is good, and they are very inexpensive without being scary!
We've stayed at enough of them to know that the chain is similar no matter where you are, and they are consistently clean and comfortable. The rooms are small, so if you have more than 1 child, you may want to book 2 adjoining rooms instead of trying to fit everyone in 1 room.