Two separate conversations, and it helps to know that before starting either. Seascapes Bira does not run the course or take course bookings — dates, level, add-ons, prices and certification all come from the school. The room and the food are booked with Seascapes Bira. The two ends coordinate.
Two calendars matter as well. Freedive Sulawesi operates from March to December, so January and February sit outside the school's season entirely. Sjenade teaches in English, Bahasa Indonesia and Dutch, which is worth knowing if the language a course runs in is a factor.
On trip length, the arithmetic is worth doing before booking flights. A three-day Level 1 course does not fit into a three-day trip. Tanjung Bira is 5 to 6 hours by private car from Makassar, with no airport, train or ferry running direct, so a day disappears at each end. Four or five nights is the comfortable minimum for Level 1; Level 2 at four days wants a little more room; the eight-day Freediving for the Reef programme needs more room again.
Build in a spare day if the dates allow. Not because the sea is unreliable — Bira's dry season runs April to November and brings the calmest seas of the year, which is a sea-state pattern rather than a visibility one — but because a course with a day of slack in it is a better course. There is somewhere to be on a day off: Bara Beach, the peninsula, and the rest of Tanjung Bira.
Rooms are on the stay page. The property is small, so course-block dates are worth confirming early. The restaurant is open 7am to 9pm daily and until 10pm on Tuesdays and Saturdays, which on a training day mostly matters at the breakfast end.