Hi!
I have a three year old and a two year and every other weekend we have an additional three year old (finacee's son). We're in a two bedroom apartment so you can guess what has to happen.
First off they all go to bed at the same time. We do dinner together, have wrestle time to drain energy, then bath time (the warm water has a big relaxing effect on them).
Bed time is strict. I've learned with three toddlers that you just can't give them an inch cause they will keep going. So one bedtime. One tried coming back out a couple of nights, but we put them right back into bed and very firmly let them know that was not ok. It stopped quickly.
We also have a toy chest that is easy to move. At bedtime it goes just outside their door so there's no distractions readily available.
If noise is problem try easing them into sleeping while noise is happening. I read in Parents magazine that doing the absolute quiet at naptime creates fussy babies with disorganized sleep patterns. I started doing little things like dishes while they slept and slowly built into vacumming. Now they can sleep through a train running through their room (although this is theory *winks*).
Lastly for about two weeks (well worth the investment) I stood right outside their room. Goofing off was a problem so I had to train them to believe that I could pop in at any time. If they didn't take me seriously I sent dad in. I would go in, lay them back down, and let them know, firmly (no shouting necessary here - just the firm, I am not playing, tone works) that it was bedtime.
All three go to bed at 8 and are asleep by 8:30 - sometimes 9 - but mostly 8:30.
The 6:30 - 7:00 can't be helped. It is a stage every early bird goes through before they learn to pop a movie on rather than waking the neighborhood. But even if you get her down at 8 she will still sleep till 6:30-7. That is exactly how my three-year-old is. I sleep right across the hallway from them in the last two weeks they quit waking me up, and instead pull their toy bin into their room until 7:30. I don't know if this is usual, but it's made life easier.
I hope some of this will help. The most important thing I think people have a hard time seeing is that YOU are the one in charge - not your child - and they need it that way. So if you are firm and consistent it may take a few weeks but you can help them figure out how to get into a good sleep schedule.