I would vote for the gym floor. It is only two weeks and he can wear earplugs and have an MP3 player etc. Shouldn't take more than 15 minutes to shower and roll up a sleeping bag and mat and there should be lockers there. THen he can nap somewhere later. Hostels are going to be even later and noisier and definitely have a bedbug concern...have a bedbug plan regardless and quarantine all travel clothing and luggage outside the house when he gets home.