Location. This Dublin hotel is in a 12th-century castle updated with modern amenities. Central Dublin is three kilometers away. The Casino at Marino and Fairview Park are within two kilometers. Hotel Features. Clontarf Castle Hotel offers a bar and a lounge and the Fahrenheit Grill restaurant, which serves a full breakfast 7-11 AM for a surcharge, as well as lunch and dinner. 24-hour room service is available. Clontarf Castle Hotel has a fitness facility. Business amenities include 10 conference rooms, and a business center with complimentary wireless Internet access. Secure outdoor guest parking is complimentary. This is a smoke-free property (fines may apply for violations). Guestrooms. Each of the 111 guestrooms is individually decorated and has a private bathroom with hair dryer. Amenities also include air-conditioning, desk, laptop-compatible safe, LCD-TV with pay movies, and coffee/tea makers. Guestrooms are accessible via exterior corridors. All guestrooms at Clontarf Castle Hotel are non-smoking. Cribs are available.