Agree with Brendan bar the comment on house.
You haven't given any information to allow a meaningful response re house. What stage are you at in life, age, where work, perm or temporary, fixed location, etc.
Ordinarily I would advise strongly against buying a house with another single unconnected person. I have seen these end badly, grand when everything is going fine, but when people couple up, have different objectives, have someone staying over frequently (they can as its their house too), these all cause big problems. Never mind the financial side. Not saying never but need to see full situation. I don't buy this line that is used that buying with another single person is a way of getting on the property ladder in most situations. It may be in a limited number.
Also why have you an objective of investing in property? You say as a long term investment. Do you plan to live in or rent. If live in I understand the reason.