Things to think about.....
Wood is organic and slowly changes over time. This means that if you hang things on the wall, the space behind whatever you hang will stay the original colour while the rest of the wall slowly changes with exposure to sun and environment. My walls are cedar strip and I don't worry about nail holes. They are easy to fill if you have a hold that bothers you. The good thing about nails in the walls is that you don't have to look for a stud because the wood is strong enough to hold up what you hang - unless you're hanging very heavy items. Wood walls don't need much care. Buy yourself a brush on a long stick for knocking off cobwebs as they will show up against the wood.
Wood floors are equally easy to look after. A wood floor will have been treated when installed so there is good finish on the wood. Water won't damage it. I sweep my floor often and damp mop it when it needs mopping. Wipe up spills and spot wipe spots if you see them. If I'm feeling like a deep clean, I'll do a hands & knees scrub but honestly, I don't notice much difference so have only done that a few times. Maybe I'm a lazy housekeeper but it looks clean.
My kitchen countertops are also wood and they need protecting from cuts, so always use a cutting board. Other than that, they are treated just like any other material.
Living in wood is easy because wood is just easy to look after. If it starts to look worn, simply have it refinished, which means the wood is sanded down and covered again with a protective sealer. Our wood floors are 30 years old and I'm ready to have them refinished now that we will not be adopting any more dogs with nails that are hard on floors. The kitchen counters are just as old and pretty much look like when they were built.
Enjoy the lovely patina of living with wood.