Finally I decided to reserve time to figure out how to switch keyboard layout to be able to write language specific characters.
As usually the Arch Wiki was very resourceful and helpful https://wiki.archlinux.org/index.php/Keyboard_configuration_in_Xorg
Just run the following in terminal and it worked with Alt+Shift
mike@localhost$ setxkbmap -model pc104 -layout us,sk -variant ,qwerty -option grp:alt_shift_toggle
I then added the configuration into Xorg servers config to avoid issuing the command after restart.
# /etc/X11/xorg.conf.d/00-keyboard.conf Section "InputClass" Identifier "system-keyboard" MatchIsKeyboard "on" Option "XkbLayout" "us,sk" Option "XkbModel" "pc104" Option "XkbVariant" ",qwerty" Option "XkbOptions" "grp:alt_shift_toggle" EndSection