I have done multiple cruises on large cruise ships both alone and with friends/family. This was my first trip on a small ship (322 passengers) and I was concerned about whether it would be a good fit for a solo cruiser. In fact, I was not the only solo cruiser on board, there were about 5 of us. I had been concerned about dinner as there is no assigned dining, but in the main dining room I never had a problem asking to be seated with others at a large table. The ship also has 2 reservation only restaurants, where the seating was not as smooth. I tried making a reservation for myself and asking at the time of reservation to be seated with others. I was told that would not be possible without their permission. Two other solo cruisers were dining in the same restaurant on the same night, but it took us to put ourselves together. No problem, the main dining room was just fine anyway. Be advised that if you want to go to the reservation restaurants, do it very early in the cruise as they book up. Also, the reservation restaurants only change their menu one time during a 10 day cruise, the main dining room changes nightly.
Couple of tips about going:
Yes, the weather is warm but the airports, airplane and the common areas of the ship can be cold. Take more long pants and light sweaters. The dining room is not dressy, but pants rather than shorts is appropriate.
If you travel alone, you have the dreaded single supplement. As a result, I took one of the lower priced rooms on deck 4 that does not have a balcony but had a large window. It is a very nice spacious room with a large bathroom that has a full sized bathtub. The lower cost balcony rooms have the same square footage as the window/porthole rooms. My room was in the middle of the ship which you may wish to consider if you get sea-sick. Due to rough seas, some people on the top decks at the front or back of the ship felt the roll more than I did.