Is the city life hard on my dog?

Aside from the half an hour of play time at the park I'd suggest you take him on two half an hour walks daily. He seems like he does need more mental stimulation as well as exercise daily. Walks help provide mental stimulation and physically exercise. Plus the fresh air would be good-for both the dog and you. If you don't have time to take him on the walks daily, hire a dog walker :) Many dogs can thrive when living in the city/an apartment as long as they are given the correct amount of exercise.