Me and my friends had a good time at Jason's & Kim's. It is a bit outside of Manchester but easy to reach by bus and the bus comes every seven minutes so it usually doesn't take long to go to the city center. The house is small but enough for three to four people and it provides everthing you need. The terrace is great! Since we're not from the UK, closing the front door was difficult at first but in the end we figured it out.
I'd totally recommend this place!