The Skotel is for me the best price quality available in Amsterdam. I live in Switzerland and I frequently visit Amsterdam. The alternative for me was to rent a small place but this is defenetly the better option.
The Skotel is run by students and very friendly. OK it's not in the exact center of Amsterdam but than you would also pay another price.
The only thing I can think of as an extra service they could offer is a rental bike. For the rest I can't think of anything!
- Free Wifi