I would rip up the linoleum tile and see what you have to deal with in that area. If this is a small area, you could hire a professional to do the small area. For example, 50 sqft times 2.50 is only $150.00. Remember that it is hard to match stain. If you can get away without sanding anything completely down to the wood. Then, it should be easier to match existing floors. Test for a wax coating in front of where end tables or coffee tables sat. Places where furnature polish may have been sprayed. Old finish is not a problem. If the floor is 30 yrs old there is a good chance they used varnish. Since this board was down for a week, you may have to wait a day or two for some of the experts to return and respond with better advice than I can provide.