This is typically called "credit-card touring." It's quite popular.
I note, however, that you said "most" nights. I assume that you won't be carrying any camping equipment, so this implies that you will be sleeping inside "all" nights.
Assuming you're planning to tour in some first-world country with a good support system, the only "repair equipment" you really need is enough stuff to fix a flat tire, which isn't much at all. Everything else can be handled with your thumb and/or a cell phone.
So all you really need is some clothes to put on each night, and some basic toiletries. You should be able to carry this easily in a standard seat-post rack. You can put your snacks and sunscreen in a handlebar bag. You can rinse out your riding clothes in the sink each evening.
Your low gear is 33 gear-inches, which is only suitable for the extremely light touring that you are planning.
Your plan is fine. Have fun!
P.S. The Giant web site for your bike is very odd. The picture shows a bike with 32 spokes front and rear, but the specs say that the bike has 24 and 28 spokes in the front and rear respectively.