We bought a little holiday home 10 years ago when we were still working. It is in the Mourne mountains and a beautiful quiet location. It has central heating, a shower room, a bathroom and 3 bedrooms - all on a neat scale. Also a wood burner in the living area. Essential in the bleak winter weather. When working, we used it as a frequent bolt hole, a great place for winding down. However, the acquisition of grandchildren and now a disabled dog has rather put barriers in our way! So it isn't used as much as we would like.
It tends to be one of us goes down on their own to get a bit of much needed space.
However, our family still likes to use the cottage from time to time.
Advantages: always available, own place so we have control of it, lovely location, easy to travel to.
Disadvantages: not used enough because of time constraints, maintenance, in our case the weather can be poor.
Depends what you want, I think, and how much time you have to use it.
Disadvantage