Multi-night stay at bed and breakfast
 

Would the inkeeper be expected to change the linens and towels during a three night stay and check the room for various to be restocked?

B&Bs can vary, but the ones I've stayed at have had daily maid service. I can't say if they changed the sheets or just made the bed, that really doesn't matter to me either way. I'm pretty sure towels have normally be changed. If you have a particular B&B in mind, you should contact them and ask about their policy.

Some B&Bs and small inns provide welcome amenities that would not be replenished.

If it's important, you really should be directing the question to the specific B&B. Because it's an independent small business, no two have the same processes and procedures.