The LED is on PA8, “0” is on.
For other ways of creating ARM-based nodes with an RFM69, see these articles, which can be useful for testing RF communication to/from a JNZ:
This is the second iteration (revision 2 never made it to an actual PCB). It has footprints for 3 sensors on the top side: BME280 (temp/humi/pressure), VEML6040 (colour), and MAG3110 (3-axis magnetometer).
The LED is on PB5, “0” is on.
The RFM69 connections are: SSEL: PA15, SCLK: PB3, MISO: PA6, MOSI: PA7. DIO pin connections: DIO0: PB0, DIO1: PB1, DIO2: PB4.
This is the first PCB prototype of the JeeNode Zero. It has footprints on the top side for a BME280 sensor (temp/humi/pressure) and for a TSL4531X sensor (ambient light), as well as I2C pull-ups. It was initially populated with an STM32L051 µC, which is pin-compatible with the L052.
The LED is on PA15, “0” is on.
The RFM69 is on PA4..7, with DIO0: PA8, DIO1: PB1, DIO2: PB0.