Try microfiber as it is easy to clean and take care of. If you are worried about stains, try an indoor/outdoor fabric like Sunbrella. I recommend Ultra Guard fabric protection in lieu of Scotch Guard. Stay away from loops and chenilles if you are worried about your dogs and their claws. Solid colors tend to show stains and pet hair, so try looking for patterns or multicolored fabrics. Hope that helped!

I would suggest you talk to kids they will tell you better than any of us.

See lobby entrance to the flat you can have PVC wall decor, and for permanent fix you can have a look at tiles with wood finish

Hello, The window looks a little narrow but is placed in a really interesting place . You could go for creating a nice little bay window type here .for this you would need to create a sitting using wooden ply slightly uptil cill level and a foam seat mattress of the size. For dressing the window, roll up curtain could work the best here,I will attach some references.  Further if u wish to decorate it more in Roman style you could opt for a three side frame made around the window opening (On the wall) Shivani Chandra, Architecture Student Alittle