While this seems like a service that would be reserved for first class passengers only, business class also gets access to this amazing option. (upgradedpoints.com)
However, other first class passengers are often paying premium to avoid the trials of the economy cabin, like sitting next to crying children. (travelandleisure.com)
The airline offers the «private room» which offers exclusive lounge access to first class passengers only. (travelcodex.com)