score:3
I did the same and I never got into trouble at the border. Usually, they might ask the address of your accommodation and I gave mine which was different than I told the embassy because I got a better deal. And I got no problem with that. However, if you're going to stay at your friend's place I'd suggest have a copy of his passport and his cell phone number with the address to present at the border just in case the immigration asks you. If you can specify clearly and confidently that he's your friend and you will be leaving the country at the date you specified. I believe it should be enough. However, I'm speaking from my past experience.