Just stayed at Ren AMS 2 weeks ago on points. Direct train to Central Train Station from Schiptol. Ren is very friendly and easy 3 min walk from Central Train Station (also most boat tours leave from there). Well located with many many resturarants nearby and well as excellent shopping street just 2 minute walk. At Central Train station you can get buses to most anywhere in AMS. Internet is very expensive at 20 Euros per day but if you go to street behind REN (out front door of REN turn right, go down alley beside REN and left where it dead ends)there is very cheap Internet on left in that street. The breakfast buffet was very expensive (over $25) so I would go elsewhere. For amusement walk down alley right in front of hotel. There are a 10 or 12 "red lights" in that street.
Do be careful of free Toberlone chocolate at front desk- it's addictive.