How do you say Welcome to my home in Japanese?

Answer 1

どこに住んでいる？ (doko ni sundeiru) means "Where do you live?" in Japanese. If you aren't close with the person, using どこに住んでいますか (doko ni sundeimasu ka) is more polite.
doko ni sunde imasuka どこにすんでいますか。

Answer 2

Ofurosato ha dochira deshouka?

Answer 3

Sumimasen

That is incorrect. 'Sumimasen' means 'excuse me.' 'Irrashaimase' means 'welcome.'

"Irrashaimase" is only for welcoming someone to a business use "Yokoso" for everything else

Answer 4

The sentence 'I live in London' would be translated as 私はロンドンに住んでいます (watashi wa rondon ni sunde imasu). The 私は (watashi wa) may be omitted as the subject of a sentence of often assumed in Japanese.

Answer 5

'I live in Japan' would be expressed as私は日本に住んでいます (watashi wa nihon ni sunde imasu) in Japanese.

Answer 6

"I am here" would be translated as 私がここにいます (watashi ga koko ni imasu) in Japanese. The more casual alternative would be 私がここにいる (watashi ga koko ni iru).