I suggest not choose this as your cold wallet because it is very tricky to use and might have an error if you are a newbie and might vulnerable to hacks.
If you created your paper wallet properly you might safe but if this your first time, try to send small amount if that is work.  Alternatively, hardware wallet is also good but you need to purchase and spend a few bucks for this.

Yes, it considered as good.  As people say above, it been years too I'm using Electrum wallet, so far so good and I don't have encounter any problem, as long as you downloaded correctly and properly created your wallet, you're safe.  As much as possible keep your private key in a safe place.