Your Hausmeister's use of the word "erneuern" is slightly odd. What I think he means is "austauschen" (= exchange). Also, I don't think you will have to pay anything. You're paying rent already and you did not ask for a new toilet bowl, it seems. Aaanyway, here is a grammatically corrected version of the things you planned to say already: Ich habe ihre Notiz an meiner Tür gefunden. (= I found your note at my door.) Aber ich habe niemanden gebeten, mein WC zu erneuern. (= But I did not ask for anyone to exchange my WC. [Careful! This sentence might seem impolite. See below.]) Halten Sie das Papier für mich? [I don't understand this one... this means "Are you holding the paper for me?" What paper are you speaking of?] Muss ich dafür bezahlen? /or/ Muss ich für die WC-Erneuerung bezahlen? (= Do I have to pay for this? or Do I have to pay for the WC exchange? [Note that the "da" in "dafür" refers back to a context established before, so "dafür" and "erneuern" can not go together]) Wenn ja, was kostet das? Können Sie die Zeit ändern? [Both already correct.] Vormittags habe ich jeden Tag Unterricht. (= I have classes every morning. [Style note: do not start sentences that only consist of a main clause with "weil". "Weil" should be used to start subclauses only, example: "Ich bin genervt, weil ich Hausaufgaben habe." or "Weil ich Hausaufgaben habe, bin ich genervt."]) Könnte der Handwerker auch am Nachmittag kommen? (= Could the plumber come in the afternoon? [bekommen = get/receive, kommen = come] ["könnte" is a bit more polite than "kann"]) Back to those first two sentences: Instead of saying that you did not ask anyone to do anything to your WC, maybe try: Ich war etwas verwirrt, als ich ihre Notiz gefunden habe. (= I was a little confused when I found your note.) Was muss denn an meinem WC repariert werden? (= What has to be repaired about my WC?)