Want to stay together with a minimum of six beds, three bedrooms, and two bathrooms. Central location near the Metro ideally but open to suggestions. Air conditioning preferred. No parking needed. Can maneuver steps if not more than four floors up. Mid-range pricing would be nice.
What city? Approximate budget in Euros?
A 3 bedroom place will be a bit difficult, but not impossible to find. I suggest checking Booking.com and enter your parameters (apartments, price range, #bedrooms and #baths, dates, etc.) You will get an idea of what is out there, even if you don't book through them. Also, enter "Apartments in Paris" in the search box above, filter for forum, then one year or less. Some threads should pop up with ideas, but you may need to scroll through and read several to get some names of places that fit your needs. Good luck!
My bad. I assumed Paris (metro reference), but search Booking.com and the forum for whatever city you are talking about. If it is Paris, maybe change your title to generate more responses. It is a bit vague. Also, when are you going? Do you have requirements such as elevators, parking, etc.?