This is the 101st most frequent Czech word.
svém
"Svém" is the locative or instrumental form of "svůj," meaning "one's own" in English.
In this sentence, 'svém' means 'one's own,' referring to possession of the house by the subject.
Ve svém domě se cítím pohodlně.
I feel comfortable in my own house.
'Svém' is used to indicate possession of the magazine, implying that it is the speaker's preferred one.
Našel jsem to ve svém oblíbeném časopise.
I found it in my favorite magazine.
Here, 'svém' refers to the group or individual's ownership of the project being discussed.