Unwelcome guests! Hi Nicky! Wow, you're faced with a big problem. Let me tell you that you've commited a huge mistake: you mustn't let strangers get into your house. But well, we have a problem and we're going to deal with it together. Firstly I want to recommend you to talk with them softly, trying not falling out with them. They just going to be informed about leaving your flat, which is an ordinary point due to space's lack, cleaning or your schedule. Surely the'll understand you, because it's your apartment, so it's your call. Honestly, there are good reasons to face the trouble, like city's cheap hostals, which are close to your house. If the thing is getting worse, you could use more convincing and unexpected methods for force them to abandon your house. They probably have to go out from your flat sometimes, right? Therefore, you can take out their suitcases and put them in the street, unless they have a key. In this case, you can change your lock so that they can't enter into your flat. It's a bit cruel, I know, but you know: "The greater the illness, the bigger the pill". The best of luck and let's keep in touch!