I’ve been researching brownstone renovations lately. Renovations can be hard work, and so is finding the right contractor to do the work for you. Brooklyn resident and architect Jean Brownhill Lauer created Sweeten to make this process easier. It works like this: You post your proposed project—a new kitchen, an apartment combination, a wall of custom-built bookcases—and each is matched with three to five hand-selected, preapproved local contractors, carpenters, interior designers, artists, or architects. You then check out a prospective match’s profile page to size up past projects, then get in touch to negotiate details. Contractors pay to be listed so the site is free to customers, and because the site is a trusted referral source, your chances of getting the old do-the-demolition-and-disappear move are minimal.