First of all, a bit of context. My wife and I earn roughly 4400€/month.
We are two years into a 15 year mortgage for a flat, at a very low interest rate (150k€ @ ~ 1%), we reimburse about 1000€/month.
After taxes, food, and so on we manage to spare about 1000€/month.
For the time being, the money sits in savings account, where the money is guaranteed by the French state, and any earnings are tax-free but the yield is very low (0.75% these days).
We have a kid on the way, and we would like to buy a house in a few years.
Finally the question:
As a French couple, saving 1000€/month, and planning to use it in the next two to five years, what would be a good investment?