Boy, am I ever glad to hear someone's getting roller shades. I still have horizontal blinds in our bedroom and I hate those things. They are so grubby, but I don't want to waste my time cleaning something I hate so much. That's why I've been thinking of going with a roller shade, but I haven't heard many people talk about them and wondered if they were considered too old fashioned. We used to have a roller shade in DD's bedroom. She liked total darkness when sleeping and it was the only thing that would keep the room dark enough. It was one of the tension pull ones and the drapery company that we got everything from attached a very pretty metal pull on it. It looked very nice. I really can't say we had a problem with it losing it's tension either. I'm not familiar with the continuous loop chain, but it really sounds like it would be a lot easier to control the height of the blind. Whatever you decide, please post pics. I'd love to see how they look in your lovely room.

This is what I did. We installed room darkening shades inside the window depth. Then, over them, we installed Duette linen pull up blinds. I also added drapes. In the evening I raise the Duettes and pull down the darkening shades, then the Duettes and it's pitch black in the room. I can't stand any light showing. I even taped the light on the phone and tv. This was ten years ago and still holding up like they were installed yesterday.

Many hotels have them, just google double roller shade....plenty of options. A local drapery company will do a good job of measuring perfectly and installing if you are not DIY.

blinds.com give you the blackout / privacy liner option. They are the best site to work with. great customer service. if you need to see samples, go to Home Depot and look at their books. same products. I had their Bali Woven Wood in a black/brown and you could never see through it at night. but like I said, it comes with a liner option. this one had a light liner on the back. i think it was also Bali (and make sure you get the optional 1" edge binding.) They have a light filtering backing and a blackout liner. https://www.blinds.com/c/woven-wood-shades/55 https://www.blinds.com/p/levolor-natural-woven-shade/505221 another option is the double cellular blinds. this one is in black w/the standard liner on the back. keeps the room pretty dark. I think this was also Bali. maybe levelor. 3/8" cell. https://www.blinds.com/p/bali-blackout-cellular-shade/46