Tim,
Templemore is the parish that includes the city of Derry. So it’s a civil and religious administrative district.
Creevy is a townland within Templemore. A townland is a uniquely Irish administrative unit. Creevy (more commonly Creevagh) is split into Upper & Lower. Upper is 371 acres and Lower 351. It would all have been agricultural land in 1831 but today some of Creevagh Lower is an industrial estate, though most remains agricultural land. Link to a map here:
http://www.placenamesni.org/resultdetails.php?entry=681
Houses in rural Ireland did not have street names or house numbers until the 1950s, and even today some don’t. Your townland alone was enough to identify you or get a letter delivered. The number 11 in the 1831 census is not part of any postal address, it was just the enumerator’s private numbering system to help him identify each property in his records. (Records which have not survived). Combined population of both parts of Creevagh in the 1901 census was 98 people. Most engaged in farming plus some clerks, domestic servants, a barrister and folk working in shirt factories. (Derry was famous for making shirts in the late 1800s and 1900s).
The modern Heather Rd goes through the middle of Creevagh Lower and Creevagh Rd crosses Creevagh Upper. Creevagh Upper is perhaps 2 miles from the city centre. Not terrifically convenient for a cooper whose trade was presumably based in the city, where there were breweries, distilleries, warehouses and other industries which used lots of barrels. A move to live into the city itself wouldn’t have been surprising.
Finding Mary Robinson’s birth and marriage would involve searching the church records I mentioned previously. Tradition was to marry in the bride’s church, so it doesn’t always follow that a marriage and subsequent children’s baptisms were in the same church. The Creevy family was evidently Presbyterian, so 1st Derry Presbyterian’s records are an obvious starting point (they start in 1815), but with the apparent daughter Jane marrying in the Church of Ireland, I’d check those too. The Cathedral where she married has records back to 1642. Marriages in Ireland had 2 witnesses, same as in England. Not always the parents though, but often could be. For a marriage in the early 1800s, you rarely get more than the date, the couples names and the 2 witnesses.
Very few people in Ireland were able to own their homes in the 1800s, and your ancestors would undoubtedly have been renting. Looking at the 1901 census for Dark Lane, it appears that all the homes there were owned by the Honourable Irish Society.
From the Londonderry Sentinel of 25 November 1954: Dark Lane, Londonderry is to be re-named "Joyce Street" as from the start of next year, following a memorial from residents of Dark Lane seeking such an alteration which came before a meeting of Londonderry Corporation Planning and Housing Committee on Tuesday.
From what I can see on-line, Joyce St was demolished in 1972 in order to build a new road.
The song The Town I Loved So Well made famous by Phil Coulter mentions Dark Lane in the first verse-
In my memory, I will always see
The town that I have loved so well
Where our school played ball by the old gas-yard wall
And we laughed through the smoke and the smell
Going home in the rain, running up the dark lane
Past the jail and down behind the fountain
Those were happy days in so many, many ways
In the town I loved so well
https://www.youtube.com/watch?v=KAqOC5iJ5o8
You can see St Columb’s Cathedral where Jane married, in the early part of the youtube clip, and again in the background in the part where the young boy kicks a ball up a street.
Griffiths Valuation for c 1858 lists Mary Robinson in Dark Lane. So I think you can infer she was a widow by that year, and obviously she was living in the city. She had plot 12 which was a house and yard. Her landlord then was the Rev Maughan.
https://www.askaboutireland.ie/griffith-valuation/index.xml?action=name…