This depends on the tap range you choose, but is typically a minimum of 0.1 bar (1 metre head) for a screw-down (rubber washer) tap valve and 0.3 bar (3 metre head) for ceramic disc valves, although the Ravoque range will need higher pressure. It's best to seek professional advice before making your purchase.
All brassware should be cleaned with warm soapy water and buffed up to shine with a soft dry cloth. Avoid using any abrasive or acidic cleaners as this may damage the product.
Regular cleaning after use will keep your taps looking good.
Water Hammer is the result of high water pressure causing vibration on the pipes and can be reduced by the installation of a pressure reducing valve. Be sure to check that your pipes aren't loose as this may also be a cause.