Re: how to get a family home? Selling or renting current property
This is a very difficult decision.
To simplify things, the price you paid for the apartment is irrelevant. Negative equity is an irrelevant concept, given that you have the cash to wipe it out.
You have a property worth €240,000
You have net borrowings of €175k
You have reliable annual income of €110k
So, overall you are in a much better position than most.
If you keep your current apartment and buy a home, you will end up with too much exposure to property. You will be at risk of further house price falls, and more importantly, a loss of rental income if you can't rent the property.
My gut view is that if the apartment is not suited to your needs now, put it on the market to see if you can sell it.
If you sell the apartment now, you will have €65k. You could probably get a loan of €400k, so you could buy a property for around €465k.
If you can sell the apartment now, you will be in a very good position to get a deal in buying another property.
Is the house swap your ideal house? If not, then you might consider renting from each other until you find buyers for your houses. You rent your apartment to them for €500 a month and they rent theirs to you for €800 a month, or whatever.