I had the position of kitchen assistant, which I assumed was just a pot washer or helping with deserts/side dishes based from the ad. My contracted hours were 10/week as I was at university.
They were training me as a chef, which for some people would be a dream but for me ideally I just wanted a simple part time job. The learning curve was what I'd consider steep and the workload was demanding. I was told how to make several things at once (how, what to use, equipment etc) then expected to remember it from that. Expect to be thrown in at the deep end as it gets extremely busy and stressful.
The hours were unsociable (late evenings and weekends), but that's to be expected to an extent depending on contacted hours. I was meant to do 10 hours a week but I was doing around 30 with late finishes. I also did a few split shifts with a couple hours break in the middle. There was some staff that worked for 2 weeks covering without a day off. Finishing times were usually after close (upwards of 11 sometimes) and start times usually 30 min - hour before opening.
Salary was ok - minimum wage to start but with pay reviews throughout the year. With that depending how keen you were there was possibility of being promoted. Again great if you want to be a chef!
Management were ok and easy to get on with. They were a bit disorganised at times but you could have a real laugh with them and were very understanding.
The culture will vary. It was very mixed where I was. The waiting staff were always full of energy and had a smile of their face, kitchen staff were a bit different. In the busier times expect lots of shouting, swearing and short tempers!
In summary if you aspire to be a chef then you would love it! Be warned of the hard work and long hours that come with it though. However if like me you just want a simple part time job this probably isn't for you.