Meanings of convenient houses in English

Many of the knights have built themselves more convenient houses, and have let the castles become almost ruins.

I know that population must increase, and that people had better live in convenient houses near their work.

The corporation of Lowell has built streets of convenient houses, for the accommodation of the workmen; and nine-tenths of these are occupied by the unmarried.

This arrangement is in contemplation, and will be put in execution as soon as convenient houses can be procured and fitted up for the purpose.