The League Two awards for April's Manager and Player of the Month have been awarded to individuals at different ends of the table.
He told the EFL website: "It's always nice to get any kind of personal accolade, but it's the players who deserve all of the plaudits.
"To finish the season in the manner they have takes a lot of character and determination."
His performances in April have helped put the Exiles' Football League fate in their own hands, with a win over Notts County on Saturday - or bettering second-from-bottom Hartlepool United's result - guaranteeing them safety.
Demetriou said: "I have never been nominated for this award before so I was pleased just to be in contention. To come out on top is a very proud moment for me.
"Receiving this award is great, not only from a personal point of view but it's also a recognition for what the whole team has achieved this month."