I stayed at the Premier Inn during my recent visit to the NEC for Insomnia.
The hotel is around 20-30 minute walk from the NEC depending which part of the NEC the event you are attending is and they dont offer a shuttle bus.
The hotel is nice as it has been refurbished, I was staying in room 238 and had a not so nice view of the skips.
I would avoid staying on the 2nd floor at the left-hand side of the hotel as you face it as the floorboards above your room are very noisy as people are moving about in their room (Every annoying early morning!)
The staff were friendly and I also had breakfast of which there was good enough of a choice.
I would stay at the hotel again, I would just ask not to be allocated a room in the side I was in due to the noise from the floorboards.