Accommodation

A lot of nice hotels are in downtown Reykjavik:

Grand hotel Reykjavik:
www.grand.is

Hotel Reykjavik Centrum:
http://www.hotelsoficeland.is/our-hotels/hotel-reykjavik-centrum

Hotel Centrum Arnarhvoll:
https://www.centerhotels.com/en/hotel-arnarhvoll-reykjavik

Hotel Centrum Plaza:
https://www.centerhotels.com/en/hotel-plaza-reykjavik

101 Hotel:
http://www.101hotel.is/

Radissonblu Hotel 1919 Reykjavik:
https://www.radissonhotels.com/en-us/hotels/radisson-blu-reykjavik-1919

And many more... just google it!