Not sure, some hostels are more relaxed in security than others. I had friends staying in other hostels in some cities and with one hostel I just walked in and nobody batted an eyelid, but with another one you had to have a keycard to enter the main door – so it varies place to place.

I would recommend just staying in a hostel personally, some offer single rooms as well.

I was thinking of that, but in Amsterdam its virtually impossible to find one. Any recommendations?

Try hostelworld.com – they list the majority of hostels and room choices available.

The Flying Pig will not let you in if you are not at their hostel, they have a revolving bar type thing to make sure only people staying at the hostel are coming in. I would recommend staying there if going solo just for this room, it is fantastic to meet people and have a nice smoke.