Split this tutorial in with and without Room.

[RoarGronmo]

You should split this codelab in two separate codelabs, where the first is w/o Room and the second with Room. As it is now, (new) users may get confused when the two solutions are in one codelab session.

RG

[florina-muntenescu]

Thanks for the suggestion. Given that the UI layer implementation would be the same, having another codelab would lead to partially duplicated content and double the maintenance cost.