Stayed over the weekend at the HGI Manchester and have a very enjoyable stay. As others have said, this hotel is located in center field of the stadium for the Double AA New Hampshire Fisher Cats.
We arrived in the early evening and pulled up to the entrance where an employee with the guest list was making sure only hotel guests were able to get into their parking lot. Check in was a breeze and we were given a couple of bottles of water and my gold amenity breakfast coupons.
Room was on the first floor over looking the hot tub. We could not see the stadium due to the signs in center field, but if you want a field view you pay a little extra. We had a king bed room which looked brand new from the good upkeep they do.
After dinner out with friends, we sat out on the patio at the bar and watch the last half of the game and then the fireworks they had afterward. If you spend $25 at the bar or restaurant, they give you another 500 HH points.
Breakfast was good with a kind of embassy suites approach where this is a buffet along with made to order waffles, pancakes, eggs, and omlettes. Breakfast goes for $11 if you pay for it.
Overall I had an enjoyable stay and being a baseball fan, this a great place to stay.