AC Hotel by Marriott Portsmouth Downtown/Waterfront is a 4-star hotel at 299 Vaughan Street, Portsmouth, New Hampshire, United States. Located about 0.3mi from the city center, it offers easy access to downtown attractions. Prices start from $148, and the property has 227 reviews.

Guests can enjoy free Wifi, a free business center, and a free fitness center, along with an on-site restaurant and bar, and a 24-hour front desk. Modern comforts include air conditioning, non-smoking rooms, and elevator access with upper floors reachable by elevator. Pet Friendly (extra charges), Private Parking (extra charges), Parking On Site (extra charges), Meeting/Banquet facilities (extra charges), and Kids' meals (extra charges) are available options, with free toiletries provided.

Situated on Portsmouth's waterfront, this stylish base blends convenience with comfort, inviting travelers to explore the area with ease.

Portsmouth’s waterfront provides a stylish backdrop for a four-star stay, pairing modern comforts with easy harbor access. The city center sits about 0.3mi away, making downtown adventures a stroll away. Elegant touches meet practical convenience, from air conditioning to a 24-hour front desk ready to assist. Parking options on site cater to drivers, though fees apply for private or on-site spaces.

On-site dining options cover the tastes of travelers: Rooftop at the Envio offers a modern ambiance with city views, AC Kitchen serves up casual bites, and AC Lounge provides a chic space to unwind after a day of exploring.

Pets are allowed (charges may apply), adding flexibility for animal companions. Cash is not accepted at check-in; accepted payment methods include JCB, American Express, Mastercard, Discover, Visa, and UnionPay. Meeting and banquet facilities are available for an extra fee, and parking arrangements carry additional charges.