Great blank canvas. Without knowing much about your local area, the exterior condition and MEP systems in the house I'll make the following suggestions so take with a grain of salt ;)
First, I'd wash those walls and repaint most of the rooms a clean white or something neutral. I agree with @Account Closed on spending a big chunk of any reno budget you have in the bathroom. Sometimes people dig a retro look but you're sure to get better rent with an update. Another thing I noticed is that your bathroom has a drop ceiling and those tile inserts aren't meant for residential use. I'd replace them with a hard lid (gypboard ceiling) and install a bathroom exhaust fan during that process. There are bathroom fans that you can buy which also act as a whole-house fan (run on a low and quiet setting even when not turned on) and it's really good for any unit to recirculate the air.
My other suggestion would be to paint the cabinets if you can't live with them. Unless there are functional issues with the cabinets I wouldn't replace them in a unit you'll eventually rent out when they're already a normal wood grain. Changing pulls/knobs is a more cost effective fix. I don't know what's outside that kitchen door, but in a galley kitchen that's separated from the rest of the unit like that I would take the opportunity to replace the kitchen exterior door with one that has more or bigger lites (more glass). Treat that door like a window, and your tenants will love the added light and visual space. It's far cheaper than a plan change or new envelope opening (adding or enlarging windows).
If you have the budget, I'd look to replace the countertop with quartz (being the trend of the day) with an under-mounted sink. If you can't do quartz, I would still look at replacing the countertop with new sub-surfacing that can accommodate an under-mounted sink because it has a very high end feel that tenants will recognize when comparing photos of rentals online (add sink garbage disposal at that time if one does not exist already, it's a walkthrough gadget that helps sell and keeps your own maintenance down).
Last, I'd consider replacing door hardware since the brass handles really date a unit (hello 90's!). It can open up a can of worms when rehanging, replacing hinges, and asking yourself if doors or trim should be replaced at the same time... It may be more personal choice when it comes to doors and door hardware. The other thing that you could consider is replacing all the blinds with new ones of the same (matching) type, and if so I'd suggest something like a cellular shade or a roller blind like mecho-shade (that's a personal preference).
Congrats on your first investment and have fun!
