No window treatments are going to give "total darkness" Anyone who sells you something and says it will is a liar. Even the best blackout shades installed with side channels will block (maybe) 90% of the light coming in a window. Call a local professional to come out to your home with samples to look at. Best options will probably be a double-cell honeycomb shade or a roller shade.

Hello Ciara, Out of the two choices I would suggest roman.. I would say yes to keeping all the windows with the same look... It just makes the house feel very unified and elegant. The same for wooden venetian with tapes or shutters I'd say the same all over.. If you want different fabric in the rooms you can still have white linings for roman blinds.. so if you wanted them to look the same from the exterior of the house but have something different inside. . : ))

We have recently built a new house in Carrigart Co Donegal with great views Having difficults with window treatments to maximise the views

I have two of these windows both identical in my living room. 1.6m width by 1.2m high. All four windows open independently inwards. I’m struggling with what the best window treatment would be. They also both have a radiator underneath which can’t be blocked and my L-shaped sofa is in front of both also.