I did the Jiko wine tasting last Spring, on a solo trip. I enjoyed it a lot! The sommelier was both knowledgeable and friendly, very approachable. It's limited to maybe 8-10 people, so lots of discussion. There were several couples, a mother-daughter pair, and another solo woman. We tasted 4 wines, with accompaniments that suited each wine. It was a unique opportunity vs other wine tastings, as Jiko specializes in South African wines; they have wines there that you can't get anywhere else in the US. The whole experience was scheduled to be 2 hours, but we ran a little bit over. I will do it again.
I don't recall cost, but I'm sure it's available online somewhere...