for reference here's a link to the marriage register on the IrishGenealogy website
Marriage took place on the 9th May 1860 in St. Catherine's Church of Ireland (There's also a Catholic St. Catherine's in Dublin city)
Grooms occupation is given as bookkeeper, his residence looks like 5 Middle Patrick Place, the bride's residence as 10 Prussia Street. The groom's father William is shown as a Gentleman, and the bride's as a solicitor. Both are shown as 'full age' so 21 or over.
Thom's 1852 directory of Dublin lists just one William Gilbert, a commercial agent with an address at 8 Prince William Terrace, Grand Canal. I have not been able to locate Patrick Place yet - it is not included in the Street Index or listings around this time... In 1852 10 Prussia Street is shown as Mrs. Symes, 1858 Mrs. Moore, and in 1863 & 1868 with two names Mr. James G. Moore & Mrs. Elizabeth Moore - no sign of Godfrey that I can see either in the general index or as a Solicitor.
The IrishGenealogy website covers most Church of Ireland parishes based in the city, but I dont see any likely baptisms for Thomas. Did the couple stay in Ireland or emigrate - do you have any indications as to where he was born ?