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I think in all three examples you're starting to impede comprehension, and change the meaning of the sentence. Example 1 sounds like the caller is cleaning the apartment of the narrator, because ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/16162 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/16162 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I think in all three examples you're starting to impede comprehension, and change the meaning of the sentence. - Example 1 sounds like the caller is cleaning the apartment of the narrator, because the subject hasn't changed from the beginning of the sentence. - Example 3 leaves the friend in question: whose friend is he talking about? - In Example 2 you have to have an article of some kind — if not_my_ then _the_, at the very least.