The answers given so far are more or less accurate. I grew up in a house which overlooked the Convent grounds. I am not sure when the Convent of the Cenacle was built, possibly around the time of the first World War or possibly before that. There are photos of the site to be found in the Manchester archives.
You will find an image of the Convent here, taken in the winter in the 1960s
http://www.geograph.org.uk/photo/629074The building which you can see in the foreground is a small separate house and workshop which was occupied by the groundsman/gardener at the Convent. I recollect two or three different families living there over the period when I lived nearby. So your relative may have been living in that house while working at the convent and indeed may have been married at the time. The other houses on the site, which were much larger, were not occupied by anyone but the sisters of the order as far as I remember.
Originally, the Convent was called St Gertrude's House, a name that was engraved on to a stone capping slab near the entrance gate. This was later added to by a brass plaque with the name "Convent or Our lady or the Cenacle" on it. A photo of this can be found in the Manchester Library archive. You will also be able to find reference to St Gertrude's in the census of 1891 and 1911, too. It was a French order. As a child, I attended services at the convent, my family knew some of the sisters, I and my brother also knew the gardener and was familiar with the grounds, too. There were large greenhouses and poultry sheds. I remember that one of these gardeners in the early 1960s was called Mr Forsyth who was Scottish who lived there with his wife. I have forgotten the name of previous gardener, but he had a son (?) called Robin who was probably in his twenties in the late 1950s.
The bells from the convent tower were rung every day for the masses and for the Angelus and Benediction. The Convent had a fairly close connection with St Bede's College which was on the next block on Alexandra Road South. The College now owns the former Convent building which was called the St Regis building and lies adjacent to Wellington Road. All the other buildings on the site including the two large retreat houses which fronted on to Alexandra Road South and the main Convent building have been demolished and replaced by housing.
If you want me to supply more detailed links to photos please let me know.