In this line:
my(@hostline, $stderr, $exit) = $cs->cmd('sh run | inc hostname');
gives you all return values in @hostline and nothing in $stderr or $exit. If you are getting logged in, it should be able to run commands. Using print is a very valuable diagnostic tool. I would probably even go as far as making something very simple for testing.

use strict;
use warnings;

use Net::SSH::Perl;
$ENV{'HOME'} = 'c:\strawberry';

my $ip   = 'xxx';
my $user = '********';
my $pw   = '********'; # If you use single quotes, only single quotes 
+will to be escaped with '\'

my $cs = Net::SSH::Perl->new($ip);
if ($cs->login( $user, $pw)) {
    print $cs->cmd('sh run | inc hostname');
}
else {
    warn "Unable to login\n";
}
$cs->close;
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