Me, I'll probably settle for stable rather than comfortable, but on a long passage comfort might be more important than safety. In a rough sea, I thought she had rather a savage motion, making it hard to get around. If you are looking for a boat to go cruising in and expect to be making long passages, look for something with slackish bilges. A bit of weight will make her nice in port, about 10 tonnes seems good to me, and you need this much so that your water, fuel and stores are not too large a percentage of the total. Incidentally Rita was much better than she is now, before I cut away quite a lot of deadwood aft, and Serendipity's keel is not large for a cruiser.
Most ships have a small anti-rolling keel along each bilge.
I discussed the merits of the double cabin in the bow before. I think it's a good arrangement, and if it runs the full width of the hull, comfortable no matter which tack you are on. You need bunks that work on both tacks. When I designed the Electric Pelican, in a rush to make the competition, I drew the accommodation layout so that there were three settees, all on the same side. I realised the mistake, but had no time to correct the problem, which I could do by simply reversing the chart room layout, so sent it in as it was.