Where is the best place to look for a good deal on a hotel in Florence?

[TiredMule]

We need to find a hotel for a short stay in the next month or so, but i'm not sure where the best place is to look? It'll be for DH and I for about 3 nights. Any recommendations and suggestions very welcome please

We stayed in the mulino Firenze hotel which was fab. It is 20 mins from Florence but has shuttle service or local bus runs frequently. Has a swimming pool and lovely restaurant....

I stayed in Hotel Pierre this year, booked through Expedia. It was lovely and right in the centre. It didn't have a pool or anything like that. Just a nice room, good breakfast and perfect location

Venere.com or trivago.com laterooms.com to name a few