I also highly recommend Les Sources de Caudalie, owners being of Smith Haut-Lafite winery. It’s a beautiful place in the middle of the vineyards with a very good restaurant and they make some really great wines. I would suggest a room in the newer garden facing buildings as they are more modern and up to date. If you stay a night in downtown Bordeaux I suggest La Grande Maison de Bernard Magrez. It’s a small hotel with a Pierre Gagniere restaurant. The rooms Are not exactly to my taste ( I prefer more clean lines), but we enjoyed it for one night, and the new wine museum in town is nice to visit.
In St Emillion I recommend the Hostellerie de Plaisance, another small family owned hotel we thought absolutely lovely.
We organized our wine tasting through a Bordeaux wine group we belong to in the US, but the hotels can likely set things up for you as well.