Young, social professional - portsmouth

I am a young professional guy who's going to be working from home alongside in Portsmouth and Bristol. I do not drive but am looking to be relatively near a train station for my travel.

I am fairly quiet and like my own company and space. But I am also social and happy to get to know housemates. I do not smoke and am very cat/dog friendly. Room renting this way is new to me.

I do have a long term girlfriend who I'd like to stay occasionally but this isn't a must/deal breaker.