I think it might help if you gave us some more information. Here are some questions that will fill in some blanks:
- How long has your wife been involved with this person?
- How long is he planning on staying?
- Is that longer, shorter, or the same as last time?
- Have you planned to spend time with him one-on-one (as friends) or with him and your wife together on outings?
- Do you have an additional relationship, too?
- What kind of physical space do you live in and what will the sleeping arrangements be? Or what room will they be staying in?
- What were the most glaring things you had the biggest problem with the last time?