Joint account is a good idea.
Look at what your monthly outgoings will be, for rent and bills. Factor in travel, if one of you pays more than the other. Discuss how you will pay for food and household items.
At the start, I would both put in an agreed amount ensures you have enough to comfortably pay all bills and shopping, plus extra for emergencies, repairs etc.
Plus another joint account for saving for the future house.
I would say that at the start of living together you exercise a little bit of caution, just so you can see how you both are with money - as in, there's nothing worse than realising one of you is happy to buy designer clothes with their 'spare' money while the other person is sitting in, skint.
Then as you are settled in together and looking to buy the house, move towards putting the bulk of your money into the joint account and keeping a smaller amount for personal use in your own accounts.
In the long-term, while hopefully things will be wonderful and and you'll just pool all your money when you have a house, maybe kids and maternity leave and part-time working, it's always useful to maintain your own account if you can.