30K isn't a great salary - about what you get as a new graduate, or up to a year or so's experience (so what's with the wife, man? I suppose you Americans do sometimes seem to get married rather young).However, it works out about £1820 a month each after tax, giving you £3600 to play with. You won't need to pay expensive healthcare premiums out of this, although private is available for a little extra if not provided with your employer.Rents are expensive. Absolute minimum for a 1 bed flat is £600 a month, but working on the rule of thumb of 20-30% of your net salary you could spend up to £1100 or so. This will get you a smallish 1 bed in almost of the best parts of the city, or a 2 bed in some pretty reasonable ones. Have a look at property websites like http://wwww.rightmove.co.uk for a better idea of prices.Transport is quite expensive but you won't need a car. Budget for £90 a month each.Gertting away for a break (eg to mainland Europe) is cheap and easy from London.It will all depend on what sort of quality of life you expect. In strict material terms it will probably not compare too favourably with the US, but London has a lot more to offer. Get used to higher costs, smaller portions, smaller fridges and possibly occupying a position lower down the social scale, in a city with a strange distribution of wealth.Overall, I would say you will be able to live pretty comfortably, by virtue of living as a couple. You should easily have more than a grand (£1000) left to spunk on meals out etc so should do alright. From (limited) past experience the Americans tend not to live it up / live particularly extravagantly / go to the pub after work frequently anyway so I am even more sure you will be fine.