We had a pleasant one-night stay at The Bull while we were in town for a friend's wedding. We were slightly confused at first as you check in at the pub's bar, with the rooms on the floor above. There's an interior security door to keep the room level private and also to cut down on noise, so we didn't have any concerns there. The manager that greeted us was very friendly and helpful in getting us settled in.
The room itself had very recently been refurbished and was very clean and welcoming. The mattress and bedding were comfortable and we had a great night's sleep. The bathroom was older and not as modern as the room, however it was clean and everything worked perfectly well, which is all we really asked for. As we really were only in the room to sleep, it perfectly suited our needs.
The pub does close at midnight, so if you aim to be out later, you just need to let them know so that someone can let you in. But it's also nice that the pub closes at midnight because you don't have to worry about noise in the middle of the night. And it's just a super convenient location, right in the middle of town and a 3 minute walk to Battle Abbey.