Thank you for your advice!
I'm in Ireland so I don't how the tax exemption thing you mention works but i'll look into it.
Besides, I'm alone, don't have children so I'm able to save and invest about half my salary every month so it shouldn't take me more than a 2-3 years to save up for deposit, so really I wouldn't have to wait for that long to buy a buy to rent house after I buy my own house!
thanks again!