There are new apartments at Merrimack Premium Outlets and in the southern part of town opposite Harris Pond. There are new apartments behind the 360 Mall near exit 11 - I'm not sure if they are renting yet. I do not know what these are renting, or will be renting for, but you could give them a try.

Housing is very tight as Merrimack is a very convenient location.

On things to do: Merrimack is convenient to Boston, Metrowest, Hampton (for beaches), Southern Maine seacoast, and mountains. If you provide a list of things that you like to do, then people can reply specifically. It's not the best of places for singles - the Boston area is a lot better for that.