SIN has two transit hotels. The one in Terminal One has some rooms with windows and and excellent views of the ramp. The one in Terminal Two is has no wiondows at all. Both represent amazing value for money, especially if you opt for the budget rooms which are not en-suite. Showers are located close by for these rooms.
If taking a trip to/from Australia it makes great sense to break the the journey, e.g. take a flight from Australia that arrived SIN
in the afternoon, sleep in the transit hotel and get a good nights rest, then an onward morning flight to Europe. It makes the whole journey (1) much more restful, (2) one can enjoy the amazing Changi Airport and (3) cuts back on jetlag too.
As long as you have an onward boarding pass it is possible to exit Immigration and go into SIN
city if you so wish (very easy on the train) and then return back and proceed airside again.
The two hotels can be booked on line and do not need to be paid for in advance. I have used Changi several times and never had any problems. I would never dream of going to Australia without a Nice rest at Changi!
is very similiar too.
My soul is in the sky...