If it were just my DH and I, the single bath would be better for us because I like having the 'whole' bathroom in one room. BUT with the twins (DDs age 11), it is better to have the two bathrooms with two sinks.
I prefer being on the 5th floor near the Kids Clubs, so we won't be near the laundry, but I can see how it would be nice to have it close by. Again, maybe if it were just DH and I, being near the laundry would be something I would look at too.
DJ