We stayed at Elizabeth's place at the beginning of September, 2013.
The room is quite modest, but at the same time is very nice and cozy. And the neat thing about it is that the room has windows on opposite walls, so if you open both windows there will be a nice flow of fresh air. That is why even though there was an air conditioner in the room we didn't switch it on, simply because it wasn't necessary.
The location of the house is very convenient for anyone who is going to sightseeing - it's quite close to the center and just about 5 minutes from MRT station. And in addition, there is a famous Newton food center on the way to the station (which is open 24h), so you can always have a delicious and inexpensive breakfast or dinner there on your way from/to the station.
Elizabeth was very friendly and really flexible in terms of arriving/leaving time. In short, we would highly recommend this room for anyone looking for a place close to the center for the reasonable price.