Hi nyc,
Welcome to the forum and glad to hear that you consider our city to live in.
In Manado itself, at least where I am, the internet connection is pretty good and reliable. Speed is ok as long as we talk about browsing news site, forums like this one, companies websites hosted here or pretty much anywhere...etc. Watching videos or movies may be more of a problem. I am not a gamer so I can't talk by experience but my kids seem to complain about the connection being too slow to enjoy gaming properly despite having respectable computers.
With 30 millions year you should be able to find a modest 2BR house in Manado. It would however require you to do yourself some research and to be able to negotiate. You could even find a decent house for less than that considering the fact that there are no real renting house market. You may come across similar houses at VERY different prices.
In 2003 I rented a wooden house on a 600 sqm land in Winangun, which is ideally situated in Manado, and which had 3BR and where I could accommodate 3 drivers and their family and park up to 6 cars. It was a house neighboring my MIL's house and the owner was in confidence renting it to us.
He was asking Rp 15 milions per year for it and we settled the deal at Rp 7 millions per year for it, paying for 2 years up front.
During the negotiation he told me that he was in a hurry to rent it because he was a sailor, rarely in Manado and was afraid that a family member would move in and that he would never be able to have them moving out. That was a good information. We have kept the house until 2010 with the same very low rent just telling him kindly and not too directly that it was our drivers for Rp 7 millions and a house cared for and properly maintained or his family member(s) for free and the adventure.
When we vacated the house it took him only a couple of week or so to rent it again and I've heard from the new tenant that the rent was set at Rp 35 milions a year. Keep this in mind: Manadonese don't like to leave a house unoccupied and it is always interesting to have them talk.
I believe that similar deals still exist. Perhaps not for 7 milions because this price was negotiated 13 years ago and even if it has been kept with the same rent for long it was a pretty unusual deal. However, with 30 millions a year I am confident that you would be able to find something if you spend some time looking for it.
Be aware that you will very certainly have to do some repairs yourself to have a decent house to live in by your standard. It may be paint job, minor electrical work...etc. Little things but this is what may make a difference. Also be aware that many houses in Manado only have 900W or 1300W of electrical power supply which is not enough if you intend to run several electrical appliances such as a fridge, a washing machine, computers...etc. If the power supply is not enough you will have to have the agreement of the owner to upgrade it and you will have to pay for it.