As an investment, timber houses can be just as good as brick houses. Usually they are cheaper than a brick equivalent, which may compensate for their maintenance later.

Or if it is a very old house, it is quite possibly in a good position, being closer to the town centre - in which case, it may be more attractive to tenants or experience slightly greater capital growth that again compensates for the maintenance. But don't try to do all the maintenance youself if you don't enjoy it. Too many landlords try to do everything themselves, instead of using tradesmen.