I stayed at the Nelson Avenue Pines B&B a few times. They had very low rates and were accommodating. The owners were always very pleasant and friendly. The rooms were nice with a minifridge, and cable tv.
The bed was very comfortable  with an adjoining huge well lit bathroom. 
Each breakfast was a different meal, (French toast, pancakes, etc) served with an assortment of fruits and excellent an French baked egg. 
They had a carafe of coffee as well as decaffeinated coffee. 
Any questions I asked they always replied with a smile. 

I would recommend Nelson Avenue Pines to all that are planning to voyage to Cooperstown.   

My stay at Nelson Avenue Pines was my best experience ever at a B&B! The moment I arrived I was greeted with warm, welcoming smiles and was shown upstairs to a wonderful suite! Penney Gentile could not have been more helpful, and I thoroughly enjoyed my stay in Cooperstown. The breakfasts were delicious and the rooms were clean and beds were very comfortable.

We had a strange experience at the Nelson Avenue Pines. We arrived around 7pm and no one was there! We called and after the second attempt someone picked up and told us to let ourselves in and go upstairs and find the room with our names on the door. There was no greeting, no warm hospitality that is expected at a B&B. The rooms were ordinary. Nothing quaint or charming about it. We kind of felt like we were just intruders in someone's house.

Pros
Close to Cooperstown
Delicious Breakfast
Clean

Cons
no way to lock your door when you leave and the inn is left unlocked 24/7...
no real comfy common area to relax
no afternoon coffee or tea available
no one to advise you on excursions aside from some pamphlets on our counter
no games
house is very noisy in terms of creaks and vents. enough to wake you up throughout the night
not a huge deal but we did not get the room we were told we'd be staying in when we booked

This was the 4th bed and breakfast we'd stayed at and by far the least impressive.

We loved our stay at Nelson Avenue Pines!! Penny Gentile is the perfect B&B hostess - so friendly and and helpful. She always has wonderful suggestions about where to go for whatever one might be interested in doing. She is also a wonderful cook. Loved the French cuisine for breakfast :) Large comfortable rooms - each one having its own distinct and authentic Victorian decor. My favorite room was the "attic" suite on the third floor with its own darling kitchenette. Nelson Avenue Pines is within easy walking distance from the village but also affords a view of Lake Otsego from the porch - where we ate several meals. So pretty. So relaxing. Highly recommended!