Using for the first time citizenM I read the posts on doors and come to believe I have to install the app to be able to check in only after 20 minutes decided to get in the elevator and finally find the lobby/reception area which in Boston is not on street level lobby but the 4th floor.anyhow after my little mistake the check in was easy and fast,the room was small but more than enough for the two of us.nice pillows,good firm mattress,modern appliances,nice shower and the place was very very clean and neat.will definitely go back or use their hotels in other locations!