Taxs included or extra?

In general, quoted and advertised price in Europe include the tax. A €15,00 price tag means you pay €15,00, not €15,00 + 6%. But for more accurate figures, I would only rely on a guidebook for general estimations. Mr. Steves makes an honest effort to update his books every year, but even he can't keep up with every rate change.

Tom is right about goods and services, including restaurant meals, groceries, department store merchandise, taxi fares, trains, etc. The tax that is included is called Value Added Tax. Never reclaimable on hotels or services, on goods that are removed from the country (and the EU) over a certain baseline all bought at one time from one place the VAT may be reclaimed at the point of departure. In hotels and B&Bs it is generally the case that the tax is included, with a couple of exceptions. Some US high level chain hotels, especially in areas which cater to lots of American business people, often quote prices before the VAT. Also, several areas in Europe collect a per person local Visitor Tax or Kurtax, or some other similar name. That will need to be paid in cash by the guests, and is never part of the basic price. Its usually around €1 or €2. All the above of Rick or no Rick, consistent throughout Europe.

Remember those rates are best guesses at the time, or shortly before, the book is printed. There are still a ton of factors - type of room (ensuite, AC, size), time of year, special events, number of rooms already booked, etc. that effect what a hotel is going to quote you. If you travel when the crowds are thin, you should expect lower rates than those published in the guide. If you arrive in the middle of a crowded festival or convention, expect the rate to be higher. The quote you do get will include the tax.