Adding custom fields to entry?

[eluser]mk3[/eluser]
What I need is best approach to do the following:
I want to do something similar to Magento commerce atributes:
While makin'link directory I want to add custom fields to some entries
for example for hotels i want to add whether they accept credit cards, is there wifi access etc.

Any sugestions would be great.

@ the moment considered types of entries are:
article, accomodation, bars, leisure, culture.