Goldilocks good question I already shared my thoughts on 1 and 2 in terms of 3 you definitely cannot lie and say it’s great I suspect you can’t say it’s bad either prob the best thing to do is say I suggest a restaurant down the block you’ll love the decor and dish x is my favorite (I hope no one takes ananymous halachik advice on a chat too seriously)
AJ I’m thrilled to hear that
Laskern the chofetz Chaim discusses that case in detail and describes how and when to say that negative information