I have a 2.5 year old and am a single mum and live in a really big lovely one bedroom flat with a huge balcony next a park, the river and a pond to feed the ducks. When she comes out of her cot in a few months there is plenty of space for a toddler bed in my room. I would have to compromise on location, area, outside space and spec of the flat if I moved to a two bedroom because as my life is at the moment I can't afford it. I constantly have people (including the health visitor at her two and a half year health check) telling me I need to move and she needs her own room. I personally don't see the issue while she's still so young and if we don't mind why does everyone else!