How much should I charge the Rent?

[Fahadbin Alam]

So I bought my first property and this townhouse already has a tenant in it. They pay 976 and I want them to sign a new lease of 12 months for 1300. Is this a good thing? the townhouse has 3 bedroom and 1 bathroom and I'm thinking of adding another bathroom. My agent told me the people there have been living it good, so it would be wise to increase the monthly rent. I do trust my agent, but I also want opinions from the Bigger pockets community.