The one thing that most wives want in their home is a bathroom and kitchen customized to their tastes. Since we will spend a large amount of time in these rooms before we die (especially wives), these need to be the most pleasant and comfortable rooms in the house to be in. You should be able to spend a lot of time in this room without wanting to leave, but if you have just moved into a house where these rooms need a little TLC, then you have the perfect opportunity to make sure you have the ability to do just that.
One of the first things that shows the age of the house is the flooring in the kitchen and the bathroom. Water damaged or molded flooring shows the most age, but old linoleum and cracked tiles can show it just about as much, depending on the extent of the damage. You should choose the new flooring of your choice according to what you can afford and make sure that the materials that you build the kitchen out of are of consistent quality, but these days it is best not to go with a linoleum floor. Travertine stone floors are in style and are expensive, but are easy to take care of and will last a long time. It will be harder for water and mold to get underneath this than linoleum, as well.
While the kitchen floor is at risk for water damage and mold, the bathroom floor is even more in danger. This is because a much larger amount of water goes through the bathroom every day than in the kitchen, so making sure that this floor is very watertight is essential if you want the floor joists underneath to maintain their integrity over the years.
You also need to consider the fact that the kitchen and the bathroom are the two rooms in the house that are the most humid. You should have a range hood installed over the stove which will serve as a vent to draw the steam out of the kitchen and stop the ceiling from absorbing water and thus becoming molded over time. Mold is an extremely unsanitary and unsightly thing to have in the kitchen, so making sure the steam has a place to go is a good idea. An exhaust vent should also be installed in the bathroom above the tub or the shower and depending on your budget, the light in the room can also be included along with the vent.