Cape Town in Feb is fantastic, hot and sunny but most people are quite relaxed because it gets manic over Christmas & New year so by Feb everyone has aclmed down again. If you plan to surf bring or rent a full body wet suit because the water is proper cold.
Only problem is you really should hire a car and get out of the city, do Hermanus, Wine Route, Garden Route if you have time there is loads to see so 1 week is nowhere near enough.