Personally, I'm in love with claw-foot porcelain tubs. I think they embody old world charm and can positively change the look of any bathroom. Unfortunately, my bathtub is quite ordinary. Either way, porcelain enameled tubs and sinks no matter the style require some care.
TIP #1 - Do not use abrasive cleansers to clean your tub. Abrasive cleaners can dull and even scratch the shiny surface and the very smoothness of that surface is both what makes it shine and what makes it easy to clean.
TIP #2 - After cleaning your porcelain tub or after every shower, use a microfiber towel to dry it. Drying the tub produces the best appearance by getting rid of water marks and lingering soap scum.
Hope this helps.