I recently ripped up several layers of linoleum from a kitchen floor to expose the original hardwood floor. Parts of it are in good shape and other parts are pretty rough, with gaps and a little buckling (though not bad).
The house was built around 1890 and is now divided into apartments. Since it is a rental unit, my goal is to make it look nice but without spending a fortune. Parts of the floor are a faded red (either from old paint or some kind of varnish), whereas other portions of the floor are dirty brown, almost black. There are also numerous nail holes and it has a bit of a slant. I've thought about painting it and then covering most of it with a large rug. Is there any other way to clean this up without doing a major refinishing project or covering it with vinyl?