With that location Dive Friends Yellow Sub could be a good option. Your rental property is farther south than I thought so their main location at Yellow Sub is the lower blue arrow on this map - w/o gear you could walk there.
FYI look up
it rains fishes for a nice meal there. You could probably walk - it's just a little south of Dive Friends - maybe 2 blocks? Excellent food, great harbor views but sort of on the expensive side.
I didn't take a shore dive class since we learned to dive in SoCal - a lot of that makes Bonaire look easy.
One thing I'd suggest if you go out on your own is plan your entries at first. Even some of the resorts are good dives - since you're diving with DF that means you could use the stairs/beach at Bari Reef - they also stage tanks there.
And a little farther north at their other location at Hamlet there's a decent (but more difficult) entry to the Cliff dive site. South of town Windsock Beach is an easy entry also to get started. If the tide is out, you step off the ladder onto a sandy beach at Bachelor's Beach also.
Farther south the Salt Pier is an interesting shallower dive - beach entry but there's ironshore just offshore so try to float as soon as possible. No diving if a ship is loading.
A couple other tips - if you see a man-made looking cluster of coral rubble at a site - that's the entry point marker. The parking area is not always the best entry point either - at some sites look for a
sand channel that extends from the beach out to deeper water. That site is Vista Blue, good most mornings but the current there was ripping one afternoon on the reef - although the surface looked calm.
Unless you feel comfortable, don't do any of the Red "A" sites here alone. They're often difficult entries or swift currents.
Bonaire Dive & Snorkel Sites | InfoBonaire
Also look for easier entries here - every site shows it:
Scuba Shore Diving Region: ABC Islands
The brown stuff in the water just off the beach is the slickest ironshore because it's wet. No gloves allowed and the dirty brown stuff growing on the ropes and Salt Pier is likely Fire Coral. I've only seen it to the south.