Try these sites for accomodation:
http://hotel.visitcopenhagen.com/
http://www.booking.com
http://www.hotels.com
See the location of the Niels Bohr Institute here:
https://maps.google.com/maps?q=Universitetsparken+5+2100+Copenhagen&hl=da&ie=UTF8&ll=55.70042,12.560806&spn=0.012334,0.029054&sll=37.0625,-95.677068&sspn=35.494074,59.501953&hnear=Universitetsparken+5,+2100+K%C3%B8benhavn,+K%C3%B8benhavn+%C3%98,+Danmark&t=m&z=15
http://hotel.visitcopenhagen.com/
http://www.booking.com
http://www.hotels.com
See the location of the Niels Bohr Institute here:
https://maps.google.com/maps?q=Universitetsparken+5+2100+Copenhagen&hl=da&ie=UTF8&ll=55.70042,12.560806&spn=0.012334,0.029054&sll=37.0625,-95.677068&sspn=35.494074,59.501953&hnear=Universitetsparken+5,+2100+K%C3%B8benhavn,+K%C3%B8benhavn+%C3%98,+Danmark&t=m&z=15