Personal Space and Quiet time:
When living with friends you will not have any privacy or quiet time, and the closer the friends you are the worse it will be. You may not realize it now but you are not always in the mood to be with your friends sometimes you may want to just sit in your room and relax, and if a friend called you up you could say you were busy but if you live with a friend they will be knocking on the door and bothering you all the time, and good friends will often borrow things of yours without asking you. Where as someone you found via ad will usually leave you alone when your door is closed except for something important.
My old roommate would always go into my room to borrow my things no matter how much I asked him not to, and every time I asked she would get insulted because it was his so it should be ok with me. If your things is broke and asked and why he didn't take care of it that's a major issue of friendship. Your friend will get mad and insulted because he thinks that you value more of your things than your friendship.
The reason why you moved in to an apartment is because you needed help being able to afford your expenses, and someone you don’t know will usually be more responsible with making sure they have the money to bay their half of the bills then a friend will, a friend will ask you to help them out when they are short on cash.
One of my friends would always spend his rent or bill money in buying online card for his MMORPG character, spending to much on internet cafe, loading his globe internet broadband stick , gambling such as tong-it or poker. I like to play some poker just as much as anyone else but I always made sure to not gamble with my rent money . If I was short on money I would not gamble but rather play for fun, but I would never allow myself to not have the money to pay my share of the bills. I played online games but I have my limitation. If you tell them , they will make you feel bad, some will replied "it's their money" or " when I borrow money I'm paying it, right?" and instead of losing your patience , just go to your room or get out...
Cleaning of the Shared Spaces:
In the past roommates I had found in the news paper always made sure that any space we shared like the kitchen or living room was kept clean. If you cooked something any mess was cleaned from the counter and pots, pans and plates would be put in the sink and were taken care of after as soon as possible and never leave not until you clean so that you will not invite any insect, but friends may take advantage of the slack you will give to a friend, because they know you would be ok with it.
One of my friend will leave his dishes in the sink and when you complain they will tell you "Dont be OC's!" Wow, now I'm OC but when I went on a vacation in our Province for 3 days, the plate, the glass and pans are all in the sink .. annoying
Unless your roommate has lots of money and lets face it if they had cash they would not need a roommate, then they will be looking to save money and not want to waste money on electricity, and once you agree on things like using the dryer or electric fan two roommates who meet online or from an add sign will usually respect the rules better then two friends will. Friends will usually bend the rules, like leaving the computer on all day or running the electric fan, leaving television ON all night or worse the iron.
My friends used to leave their electric fan on all day long and would often leave their rooms and even the apartment without turning them off, and instead of being more responsible for their actions they would make up excuses like "oops I forgot" and will just say sorry but still they are doing that habit.
So before I totally ruined our friendship and get annoyed so much, I decided to move to my auntie's house and I just gave my friends a reason that it is better because I can save more from rent and fare . They understand me because they know my story and how I send half of my salary to my mom at our province to help her. A good excuses right?
These are just some of the many reasons you should avoid living with friends, especially if you want to keep them as friends. It is one thing if a friend needs a place to stay for a week or two but never ever let them move in.