Seeking low cost rehab ideas for 1980s four plex?

[Cynthia Oistad]

My agent and I spent some time touring an interesting 4-plex property today.  It was well maintained by owner, had large units and was in relatively good shape.  If we decide to move forward with offer/purchase, I would like to make a few updates to the vacant 4-bedroom unit (pics below) to maximize rent and attract highest quality tenant possible.  However, the project can't afford a high cost rehab and the high purchase price.  Would love to hear ideas on where you recommend we spend a little ($8K-$10K) on updates.  There are some unique features like a bidet toilet?  Keep or remove? Update the sinks?  The living room downstairs has no windows with vinyl floor and a large carpet mat in middle. Normally I would always paint the interior, but the paint was in great shape (might have been recently painted?) so thinking of spending money elsewhere.  Initial ideas were to white wash the wood paneling for a farmhouse look, replace hardware for kitchen/bath vanities, new laminate countertops, maybe a backsplash in kitchen?, update bath light vanity.  Carpet is actually in pretty good condition/stain and tear free.  Keep?  replace with Laminate? what color would work best with cabinets?  Thanks!!!!