Is the word refreshing have a positive connotation?

Yes, the word "refreshing" generally has a positive connotation. It is often used to describe something that is invigorating, stimulating, or revitalizing. For example, someone might say that a cold drink on a hot day is refreshing, or that a walk in the park after a long day at work is refreshing. The word can also be used to describe something that is new, different, or unexpected in a positive way, as in "The new ideas in her book were very refreshing."