Can this room be good for mixing ?

It's not ideal but you could treat.

Carpets, curtain over the window. Bass traps in the corners A quarter of the size of any offending standing waves you find and some acoustic panelling behind you. Obviously glue would be a good alternative to screws or nails. Or some kind of velcro tape, not sure that would be strong enough though.

It could be expensive unfortunately. I haven't been able to treat my room due to lack of money ! :(

It might not make it perfect but it will help a lot.