No "issue".
There will be minor vibrations on idle. Normal for these Vitz 3 cylinder engines.
Keep a check on engine oil after every 1,000km check engine oil level. Many cars reduce oil so may need to top up on 3,000km.
Acceleration is not like a Ferrari obviously, and engine noise is a bit higher on acceleration, but smooth cruising.. and no noise on cruising.. you don't even feel the speed.. good road grip.
Virtually no noise when cruising between 50 to 120km/hr... specially on motorways or highways.. can easily go 150 but don't do it and stay within speed limits.
0w20 API SN fully synthetic oil is recommended for this engine by Toyota. Find from any genuine brand, like Toyota, Shell, Total, Zic.
5w30 can also be poured but 0w20 is the first choice.