Manchester is a great city, there is lots of things to do be it shopping, the IMAX cinema in the Printworks or the many bars and restaurants that exist in various pockets of the City Centre.
If none of the above take your fancy and you are a film buff then you could take a look at the Film and TV Location Tour films such as Captain America, Sherlock Holmes and The Dark Knight have all featured Manchester and with Granada TV also in the city there is a rich TV history to be seen.
In terms of where to stay, I would take The Atrium Apartments, they are a good quality 3 star apartment with 24 hour reception, they can appear a little tired however don’t let that put you off as the price will almost certainly be cheaper than the Travelodge or Premier Inn and you get a lot more space. All units have a full kitchen so you can save some money by popping to the supermarket to get supplies and make your own dinner! Prices start from £55.