The Aquincum Hotel Budapest is located by Árpád Bridge in Óbuda, near the ruins of the ancient Roman settlement of Aquincum, hence the name. Very much business-like in character, it's best-known for its spa, open to non-guests, making use of the thermal waters straight from Margaret Island. The proximity of the HÉV train means you can be at Batthyány tér in under ten minutes by public transport.