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.

[eluser]GSV Sleeper Service[/eluser]
a basic schema

attributes
----------
id
name

eg
1, wifi
2, restaurant

hotel_attributes
----------------
hotel_id
attribute_id

eg
1, 1
1, 2 //hotel 1 has wifi and restaurant
2, 2 //no wifi in hotel 2