You have a lot to consider when choosing your wedding venue, for example, the number of guests, location, personal preferences etc. Here's another for you to consider - your wedding photography! So much work goes into planning a wedding and picking the perfect location. As a wedding photographer I see the results of this hard work all the time. And having been a bride myself I know how important it is to have a wedding photographer capture all the details of the venue you put so much thought into choosing.
When choosing consider buildings that are well lit, whether it be natural day light or plenty of lighting through alternative sources. However natural light is the best light. For my own wedding the chapel we used had big doors that we could keep open to let light in and the walls were painted white which bounced the light around and brightened the room. The room we had our reception in had floor to ceiling windows which again let plenty of light in. Having a lot of natural light or alternative light sources means your photographer won't have to use their flash very often.
If you can, do away with the building entirely! Have your wedding outside. You'll get amazing naturally lit wedding photographs. Though it's probably not the most feasible idea in Ireland!
Before booking ask your venue about any restrictions to photographing. Churches sometimes have restrictions. If your photographer is restricted to photographing from a back row or a balcony the photos will be limited to views of the back of your heads! Regardless of the quality of light!
Best of luck choosing your perfect wedding venue.