You may want to consider Japan. Last year, I spent two months traveling and working out of co-working spaces in Sapporo, Sendai, Yokohama, and Tokyo. It was the most productive, most relaxing, and fun time I had.
Safe all around, very organized, you can focus on what you want to do without worrying about your safety, corruption, and fear of getting robbed or taken advantage of like in developing countries like India. While traveling from Tokyo to Sapporo, I forgot a bag on train in Tokyo and didn't realize until got to Sapporo. Called the lost and found, someone had turned it in, it was still there when I arrived in Tokyo at the end of my trip with all my stuff in it.
Sapporo - Very nice city, good infrastructure, transportation and facilities, nice people, great food (Ramen, Beer, Jingiskan, seafood), beautiful women (if you into that), places to party and hangout after a hard day of work. If you like cold weather, lots of world-class ski places nearby. If you are warm weather person, go in summer as winters are brutal. There is a great co-working place in downtown core area. Inexpensive places to live on Airbnb.
Sendai - Smaller city, academic oriented (lots of universities and colleges) so opportunities to hang out with students if you are young, lot of nice places for weekend trips (onsens, hiking), check out museum and a few areas impacted by tsunami and earthquake and how they have recovered/recovering. There is a really good small co-working space for 100 Yen ($1) a day, a really great deal with 50+ Mbps internet connection. Very inexpensive places on Airbnb. Without Japanese, it may be a little challenging to navigate.
Yokohama - Nice city with a ship port and great china town, baseball stadium, lot of touristy things (Kamakura) to do nearby. Not far from Tokyo if you want to go there time to time. I spent time at two co-working places, both are great with different vibe. Lots of after-hour events at these facilities. Finding inexpensive places on Airbnb is a challenge and get booked quickly.
Tokyo - Not much to say, a major city. Can be expensive unless you go outside the core. Lots of fun things to do. Quite a few coworking spaces, lots of after hour and weekend events. The co-working space I used, regularly had poker nights and parties on weekend and tech meetups on weekday evening.