We are sailors, and Star Clipper actually spends some time under sail - we were told about 25% on our cruise. Some 'sailing' cruise ships use their sails only for photo-ops.The ship was tidy and squared away, the food excellent, and the crew lovely - with the exception of the officers.
Our cabin was quite comfortable, although one sleeper was against the hull. This didn't bother us at all but if you expect a 'walk-around' bed you might be disappointed. There may be a Stateroom upgrade with a bit more room?
There was a small but excellent buffet for breakfast and lunch, with sit-down dining in the evening. There was a small library, and I believe TV in each cabin. No theatre. No casino. If that's what you are looking for, sail on a larger ship.
Ours was very nice. The young couple one deck below us (honeymooners) could watch fish swim by their porthole when on a tack. I do believe there were upgrades to a 'Stateroom' level of luxury. But it is a small ship.