Cassia Hotels San Diego is one of the most affordable and cheap hotels near downtown San Diego. The rooms are clean and offer free Wi-Fi, a coffee maker, TV, and several other amenities.. As a hotel close to Downtown San Diego, we provide easy access to several tourist attractions such as San Diego zoo, beaches, and sea world, making us the perfect destination for travelers to check in and relax. Our outdoor pool and delicious complimentary breakfast can give you peace the mind you deserve.