Thanks, Mike. The best thing about doing it yourself is you can take your time and do it right. Most contractors are rushing to get to the next job.
Unfortunately the floor, although in good shape for being 100 years old, has a lot of nail holes, dark spots, etc. that don't look so good. I think a good, relatively dark stain will hide some of those and still look great.
Ah yes, there's only so much you can tell from a photo. Good luck, don't paint yourself into a corner - at least, not one that hasn't got an organ in it.
MG