Yes, keywords in reviews absolutely matter because they tell google exactly what services you provide,
If a customer writes great pizza instead of just great food you are more likely to rank when someone searches for pizza nearby, however, you shouldn't force it, just ask happy customers to mention the specific product or service they bought when they leave feedback,
Aside from reviews the biggest boost comes from regularly uploading real photos of your work and replying to every single review, which shows google your business is active.