I had suggested using a carrier for transporting a bunny from room to room to another member in the past, but I thought it might be awkward to use since your bunny is up in a second floor hutch. He probably wouldn’t go in on his own, though, so you might still have to reach into the hutch and pick him up long enough to get him in the carrier. You could try the towel method, but be sure you have a really good grip on him, so that he doesn’t slip out of the towel and fall.
You said that Marmar is a picky eater. Do you think that he is eating enough to maintain his weight and health? Do his poops look good? If he is not eating like he should and not making good poops, plus being rather inactive, you may want to schedule a vet visit to have him checked out. He may still just be settling in and not feeling secure in his new environment yet, but after a few more days, if you are concerned that he isn’t eating right and not being as active as he should be, it would probably be good to take him to the vet.
Regarding toys – some rabbits just don’t care for toys, or they only play with them for a few seconds, then lose interest.
Rabbits do need exercise and the playpen is good for Marmar to get some exercise in, but some articles do recommend keeping a rabbit penned up or confined to a smaller area for the first few days after you bring them home. Coming into a new place can be scary and some rabbits are more sensitive than others.