Definitely depends if the ground floor is slab on ground or lightweight structure. If it is lightweight than concrete isn't an option anyway! Concrete is a hardy material, but it needs to be protected during construction. Timber integrates that warm natural feeling that can often make or break a home! What materials are being used for the remainder of the design. If there is already a lot of timber, it can be beneficial to incorporate concrete or tiles so that the timber isn't overbearing. If the remainder of the palette is simple white plasterboard, than the warm timber floor is often beneficial.

Is it possible that there are floorboards under the carpet that can be polished? This would be ideal. Otherwise, as much as I love my bedroom floorboards, I think you should stick with carpet. You’ll never match the hallway exactly so it will always look a bit odd.

We wish to cover a tiled floor with a floating floor, don’t know whether the laminate or hybrid ?

There’s no nail holes so it’s a floating floor of some type. Impossible to tell if it’s engineered wood or bamboo or vinyl. Take the picture to your local flooring shop and they’ll be able to show you something similar.