There are a variety of affordable places to stay during your trip in Portland, including:

The Embassy Suites by Hilton
The Embassy Suites lies nestled between the Portland International Jetport and downtown, allowing for easy access to attractions, historic sites, and outdoor recreation. Nearby attractions include excursions to Funtown Splashtown, New England's largest amusement and water park, the Children's Museum, or the Maine Mall, the state's largest shopping center. The two-room suites boast a separate living room and a private bedroom, along with free WiFi, two HDTVs, a microwave, and a refrigerator, making it perfect for family and business travels. Free made-to-order breakfasts, evening snacks, and complimentary beverages await, as does a fitness center, an indoor pool, and a BusinessLink Business Center. All pets and service animals welcome!
Embassy Suites - Exterior Embassy Suites - Lobby
The Hilton Garden Inn Portland Downtown Waterfront
The Hilton Garden is the closest hotel to Portland's waterfront, featuring picture-perfect views of Casco Bay. Its location in he Historic Old Port District of downtown Portland puts you minutes away from the area's boutique shopping, fine dining, and art galleries and in walking distance of the Casco Bay Ferry Terminal. Guest rooms and suites boast complimentary WiFi, 37-inch HDTVs, microwaves, and refrigerators; the on-site Garden Grille & Bar and Pavilion Lounge assures a bite to eat whenever neccesary. Keep up on your excercise with a few laps around the indoor pool or with a workout in the fitness center. All pets and service animals welcome!
Hilton Garden - Exterior Hilton Garden - Lobby
Hyatt Place Portland - Old Port
The Hyatt Place Portland - Old Port is the only Hyatt in the state of Maine, boasting unique designs and impeccable views of Casco Bay and of the Downtown District that can be found no where else. Located in just minutes away from historic Old Port, the centerpiece of Portland's colorful culture, a stay at the Hyatt allows you to enjoy boutique shopping experiences, live musical performances, art galleries, and guided tours, all without hastle. Smoke-free and with complimentary WiFi, the Hyatt Place offers 24/7 dining options, such as their Gallery Menu, a in-house Starbucks©, and a Coffee to Cocktails bar; free hot breakfast is offered daily, and a 24-hour fitness center and indoor pool aid in staying in shape, even while far from home. All pets and service animals welcome!
Hyatt Place - Exterior Hyatt Place - Glass Lounge