For European citizens you do not need a visa provided that the stay does not exceed three months, with a valid passport with six months validity from the date of arrival is sufficient to enter Singapore and Malaysia.
Both in Malaysia and Singapore there are 7 hours less than in Spain.
There are no mandatory vaccines. We recommend the yellow fever, Hepatitis A and B and care that there is malaria in some remote areas.
Malay is the language of Malaysia and in Singapore, Mandarin Chinese and English are the two most commonly used languages.
Malaysia and Singapore have a good health coverage, but this is not cheap.
The plugs in Singapore and Malaysia are of type G (three flat plugs) so it is advisable to carry an adapter. Anyway there you can buy perfectly, do not be alarmed.
The prices in Singapore (high prices in hotels, restaurants, attractions ...) are higher than in Malaysia.
In Singapore the Singapore dollar is used and in Malaysia the currency is the ringgit.
1 ringgit : 0,21 eur.