Create a single, extremely simple and minimalistic logo for rent-lloret.com, offering apartment rentals in Lloret de Mar. An old castle sits on top of the ocean in Lloret de Mar. The design should be neutral and monochromatic, reflecting a minimalistic approach with a professional and trustworthy image suitable for the real estate market. Emphasize the concept with a single color, possibly through an abstract representation of waves or the sun, to suggest the coastal location while maintaining simplicity and universality.