Should be a nice cruise. My only concern is that there is only one real port--Funchal. Also St. Maarten but I have been there many times.
Also, watch the level of your cabin if you like to spend time on the veranda. I found that the lower levels got sea spray rendering the balconies difficult to use if the seas were at all rough.
But you can't beat that small deposit and six-month payment deadline. And Viking ships are wonderful.