Recently stayed in Bad Jelly while overnight in Kaikoura.
Be warned that this hostel is right next to SH1 (the main highway) running the length of the South Island. As it is near a corner you have trucks shifting down gear as they go down the hill which can be quite loud.
Having said that, it's a pleasant small hostel (six rooms). Lounge and kitchen are spacious and there are two showers and a couple of basins that everyone gets to share. Water pressure and temperature were fine.
Spa was getting fixed when we visited so didn't get to try it out.
Little hint.. a fast way to get to the information centre from Bad Jelly is to go through the park (right next to Bad Jelly) and down Deal St. There's a little walkway here next to the Chapel that goes down the hill and onto the main street.
All up, $54 for a double room (with $6 BBH card discount) this was value for money and perfectly fine for a short stay