Wales have not had a year to remember after missing out on promotion in the Nations League last week against Denmark and losing to Albania 1-0 in a friendly on Tuesday.
A second-half penalty consigned Wales to defeat, meaning that they end Giggs’ first year in charge with back-to-back defeats.
Despite winning just three of their nine games in 2018, Allen still believes that Giggs is the right man for the job.
"It's been a great experience for everyone since he's come in," Allen told Sky Sports .
"A lot of new ideas have come into the camp and many players have had the chance to get game time and try and impress.”
Giggs has been keen to embed young talent into this Wales squad with Bournemouth’s David Brooks and Liverpool’s Ben Woodburn being given opportunities to impress in recent fixtures.
Allen added: "We've spoken a lot about the youngsters that have come into the set up, and that's what has given us a lot of confidence about the future.
"We can't wait for the [Euro] qualifiers in March, it's a few months away and this was our last chance to be together before then.
"Our task now as players is to make sure we're ready to fire when those games come around. We're excited to see who we'll be up against."
Giggs himself was less than impressed by his team’s performance on Tuesday night against Albania, saying that they let themselves down by not playing their way.
"They let themselves down," said Giggs. "We go a goal down, we don't play our own game, we are pumping the ball in their box.
"Quite simply we turned up thinking we would win and thinking someone would get us out of trouble.
"I have been in football long enough to smell when something is going to happen and I said that at half-time because players didn't have that concentration."