Entrance might not be possible because of silting. Dredging was going to start in September 2011. In August the marina was nearly empty; we saw only one full sized yacht. There are also berths on the outer pontoon in the river and in summer they are the best place to be to catch a bit of the breeze. The marina basin gets really hot because it is quite deep down (at LW) and surrounded by apartment buildings.
Free wifi, the office will give you the code. Reception not always very good; the antenna on the outer pontoon seemed out of order.
There is a washing machine, prices € 3.50 for one coin, € 6 for two and € 8 for three coins.
For shopping there are only small supermarkets in Gelves, also one inside the marina area, but there is an Aldi about 1 km up the road to Sevilla and a Mercadona and Lidl about 2 km further on.
Inside the marina is a chandler. There is a shipyard with a travellift and a large hard standing area.
The fuel pontoon was not in use.
The bus stop is a short walk outside the marina, to the N. To Seville takes 20 minutes, € 1.35. It's cheaper if you buy several tickets in advance, but we didn't find out how or where. The bus does not go to the bus station and its final/first stop is on the riverfront. The train station is a lot further into town.
Gelves marina is suitable for wintering and we've heard from several people who've done so. Boats moored onto the outer pontoon are moved inside when there has been heavy rainfall. Hot in summer but nice temperatures in winter. Gelves town itself is nothing special but with Seville nearby no one can get bored. Security reasonable.
Prices don't vary with the seasons, so relatively cheap in summer and expensive in winter.
The marina in Seville is even more suitable for wintering because it's situated after the lock so no tidal currents.