Start with the wood, then the color
Different species and older replacement boards can take stain differently. A photo is useful for describing a direction, but it is not a reliable color standard. Ask for test areas on your actual sanded floor before committing.
Sheen is a separate decision
Matte, satin, and glossier finishes reflect light differently. A lower sheen can create a quieter visual effect; a higher sheen may emphasize reflections and surface irregularities. Ask to see the proposed product and sheen under your own room lighting.
Keep connected rooms in mind
Discuss thresholds, landings, closets, and rooms that will remain untouched. A stain change can make existing mismatches more noticeable. Decide where the work should begin and end before comparing estimates.